Bullmastiff Puppies: Complete Growth, Feeding & Training Guide
Everything you need to raise bullmastiff puppies: age-specific milestones, feeding portions, vaccination schedules, potty training timelines, and first-year costs.
Bringing home a Bullmastiff puppy is a commitment to raising a 120-pound guardian who will think he's a lap dog. These gentle giants grow fast — a Bullmastiff can gain 3-5 pounds per week during peak growth — and their puppyhood demands precise nutrition, early socialization, and patient training to shape the confident, steady temperament the breed is known for.
This guide walks you through every stage of your Bullmastiff puppy's first year with concrete timelines, exact feeding portions, and real cost expectations. Whether you're waiting on a litter or just brought your pup home, you'll find specific, breed-tailored guidance here — not generic puppy advice.
When Should You Bring Your Bullmastiff Puppy Home?
The ideal age to bring a Bullmastiff puppy home is 8 to 10 weeks. While some breeders of giant breeds prefer to hold puppies until 10-12 weeks to ensure they've passed critical developmental milestones and received their first round of vaccinations, most AKC-registered Bullmastiff breeders release puppies at 8 weeks.
Bringing your puppy home before 8 weeks is not recommended. The AKC advises that puppies need those final weeks with their littermates to learn bite inhibition and canine social cues. For a breed that will eventually weigh over 100 pounds, early bite inhibition lessons from siblings are irreplaceable.
- Confirm breeder has provided first DHPP vaccine (typically given at 6-8 weeks)
- Request health records including deworming history (puppies should be dewormed at 2, 4, 6, and 8 weeks)
- Ask for a signed health guarantee covering hip dysplasia, cardiac issues, and entropion for at least 2 years
- Schedule your first vet visit within 48-72 hours of bringing puppy home
Bullmastiff Puppy Milestones: Week by Week
Understanding what to expect at each developmental stage prevents unnecessary panic and helps you provide appropriate stimulation. Here's what your Bullmastiff puppy's first year looks like:
| Age Range | Weight Range | Key Milestones | What to Expect |
|---|---|---|---|
| Weeks 4-8 | 8-18 lb / 3.6-8.2 kg | Eyes fully functional, weaning complete, littermate play begins | Puppy is learning bite inhibition from siblings, starting to explore solid food, sleep cycles are 18-20 hours/day |
| Weeks 8-12 | 18-35 lb / 8.2-15.9 kg | Primary socialization window opens, first vaccines, bonding period | Rapid weight gain, intense curiosity, frequent napping, beginning to recognize name and basic cues, may cry at night in crate |
| Weeks 12-16 | 35-55 lb / 15.9-24.9 kg | Fear imprint period (weeks 8-11 may cause lasting impressions), teething begins | May suddenly become cautious of new things, chewing intensifies, attention span improves slightly, potty training progress becomes visible |
| Weeks 16-24 | 55-80 lb / 24.9-36.3 kg | Teething peak, independence testing, second fear period possible around 6 months | Chewing everything, testing boundaries, may "forget" trained commands temporarily, adult teeth emerging, growth rate begins to slow |
| 6-12 months | 80-120 lb / 36.3-54.4 kg | Sexual maturity (spay/neuter window), approaching adult height | Calmer energy but still mentally puppy-like, may show guarding instincts emerging, growth plates still open — avoid forced exercise, will fill out in chest and muscle through 2-3 years |
Important growth note: Bullmastiff puppies should grow steadily, not rapidly. Overfeeding accelerates growth and dramatically increases the risk of hip dysplasia, elbow dysplasia, and osteochondritis dissecans (OCD). According to the Merck Veterinary Manual, giant-breed puppies fed calorie-restricted diets show significantly lower rates of developmental orthopedic disease.
Feeding Your Bullmastiff Puppy: Portions and Schedule
Feed a large-breed or giant-breed puppy formula exclusively. These diets contain controlled calcium-to-phosphorus ratios (1.0:1 to 1.5:1) and reduced calorie density to prevent skeletal problems. Look for the AAFCO statement confirming the food is formulated for "growth of large-size dogs (70 lb or more as an adult)."
Recommended brands with strong nutritional profiles for giant breeds include Purina Pro Plan Large Breed Puppy, Royal Canin Giant Puppy, and Hill's Science Diet Large Breed Puppy.
| Age | Meals Per Day | Approximate Daily Total (cups) | Notes |
|---|---|---|---|
| 8-12 weeks | 3-4 meals | 2-3 cups/day (split across meals) | Soak kibble in warm water for first week if transitioning; feed ¾ cup per meal at 3 meals |
| 12-16 weeks | 3 meals | 3-4 cups/day | Approximately 1-1⅓ cups per meal; adjust based on body condition score (BCS) — ribs should be easily felt but not visible |
| 16-24 weeks (4-6 months) | 2-3 meals | 4-5½ cups/day | Transition to 2 meals by 6 months; approximately 2-2¾ cups per meal |
| 6-9 months | 2 meals | 5-6½ cups/day | Approximately 2½-3¼ cups per meal; growth rate slows, monitor weight gain closely |
| 9-12 months | 2 meals | 5½-7 cups/day | Approaching adult intake; some breeders transition to adult large-breed formula at 12 months, others wait until 18 months — consult your veterinarian |
Vaccination Schedule and Socialization Window
Your Bullmastiff puppy's immune system develops gradually, and the vaccination timeline is designed to close the gap between maternal antibody protection (which fades between 6-16 weeks) and the puppy's own immune response.
| Age | Vaccines Administered | Notes |
|---|---|---|
| 6-8 weeks | DHPP (Distemper, Hepatitis/Adenovirus, Parainfluenza, Parvovirus) — 1st dose | Often given by breeder before pickup; confirm records |
| 10-12 weeks | DHPP — 2nd dose; Bordetella (optional, recommended if attending puppy classes); Leptospirosis — 1st dose (risk-dependent) | Maternal antibodies may still partially block response; this dose builds coverage |
| 14-16 weeks | DHPP — 3rd dose; Leptospirosis — 2nd dose; Rabies (required by law in most US states, typically given at 12-16 weeks) | Final puppy DHPP dose is critical — it's the one most likely to produce lasting immunity |
| 12-16 months | DHPP booster; Rabies booster (1-year or 3-year depending on local law); Leptospirosis annual booster if indicated | After this, core vaccines may move to 3-year intervals per AVMA guidelines |
Always consult your veterinarian about which vaccines are appropriate for your puppy based on your geographic region and lifestyle risk factors.
The Critical Socialization Window: Weeks 3-14
The American Veterinary Society of Animal Behavior (AVSAB) states that the primary socialization period for puppies closes between 12-14 weeks. For Bullmastiffs — a breed that can be reserved with strangers and protective of family — early, positive exposure is non-negotiable. An undersocialized Bullmastiff can become fearfully reactive, and a 130-pound reactive dog is a serious management challenge.
Yes, your puppy won't be fully vaccinated during this window. The AVSAB's position statement explicitly recommends that puppies begin socialization classes before completing their vaccine series, as the behavioral risk of inadequate socialization outweighs the disease risk in controlled environments.
- People: Meet at least 30 different people — varying ages, ethnicities, sizes, wearing hats/glasses/masks, carrying umbrellas or bags
- Surfaces: Walk on grass, gravel, tile, wet pavement, metal grates, wooden decks, carpet
- Sounds: Expose to vacuum cleaners, doorbells, thunderstorms (use recordings at low volume), traffic, construction noise, children screaming
- Handling: Practice touching ears, paws, tail, mouth daily; gently open mouth and examine teeth; simulate nail trims
- Other dogs: Supervised play with fully vaccinated, temperament-tested adult dogs and age-appropriate puppies in a structured class
- Environments: Visit pet-friendly stores, outdoor café patios, car rides (short trips to positive destinations, not just vet visits)
- Objects: Introduce to bicycles, strollers, skateboards, wheelchairs — reward calm behavior with high-value treats (boiled chicken, cheese bits)
Rule of thumb: Every new experience should end with your puppy feeling safe and rewarded. If your puppy shows fear (cowering, tail tuck, freezing), increase distance from the stimulus and toss treats. Never force interaction.
When Can My Puppy Go Outside and Meet Other Dogs?
Your puppy can go outside in your own yard immediately (assuming no parvo risk from unvaccinated dogs using the space). Public areas — dog parks, pet stores, hiking trails where unknown dogs frequent — should be avoided until one week after the final DHPP vaccine at 14-16 weeks, meaning approximately 17 weeks of age.
Structured puppy classes with vaccinated peers can begin as early as 10 weeks (after the second DHPP dose). Carry your puppy in a sling or blanket through public spaces during the pre-vaccine period to provide visual and auditory socialization without ground contact.
Potty Training Timeline and Troubleshooting
Realistic expectations save frustration. A Bullmastiff puppy's bladder capacity at 8 weeks holds approximately 1-2 hours. Most Bullmastiff puppies achieve reliable house training between 4-6 months, though some giant-breed puppies take up to 8 months due to slower neurological maturation.
| Age | Expected Hold Time | Outing Frequency | Milestone |
|---|---|---|---|
| 8-10 weeks | 1-1.5 hours | Every 1-2 hours during day; 1-2 nighttime trips | Learning the routine; accidents are normal and expected (multiple per day) |
| 10-14 weeks | 2-3 hours | Every 2-3 hours; 1 nighttime trip (set alarm for 2-3 AM) | Beginning to signal (sniffing, circling, going to door); accidents decrease to 1-2 per week |
| 14-20 weeks | 3-4 hours | Every 3-4 hours; may sleep through the night | Most puppies can hold overnight (7-8 hours) by 16 weeks; daytime accidents become rare |
| 5-8 months | 5-7 hours | Every 4-6 hours during day | Reliable with occasional regression during stress, illness, or schedule changes |
Method: Use a consistent cue word ("go potty" or "outside") every time your puppy eliminates outdoors. Reward immediately with a high-value treat after they finish — not after they come back inside. Use an enzymatic cleaner (Nature's Miracle or Rocco & Roxie) for indoor accidents to destroy the scent markers that trigger repeat offenses.
Troubleshooting frequent accidents: If your 14-week-old Bullmastiff is still having more than 2-3 accidents per day, consider: (1) Are you taking them out frequently enough? (2) Is the outdoor potty area consistent? (3) Are you rewarding effectively — is the treat actually high-value to your dog? (4) Rule out urinary tract infection with a vet visit if accidents suddenly increase.
Crate Training Progression
A crate is essential for a Bullmastiff puppy — both for potty training management and for giving your growing puppy a safe den. Invest in a 54-inch wire crate (MidWest Homes iCrate or ProValu) with a divider panel so you can expand the space as your puppy grows. A crate that's too large defeats the purpose, as puppies will eliminate in one corner and sleep in another.
| Age | Maximum Daytime Crate Time | Nighttime | Notes |
|---|---|---|---|
| 8-10 weeks | 1-2 hours max | 2-3 hours before potty break | Crate should be near your bed; expect whining the first 3-5 nights |
| 10-14 weeks | 2-3 hours max | 3-4 hours before potty break | Begin feeding meals in crate with door open; practice short absences from room |
| 14-20 weeks | 3-4 hours max | 5-7 hours (overnight) | Most puppies sleep through the night by this age; leave safe chew toy (Kong stuffed with frozen peanut butter) |
| 5-8 months | 4-5 hours max | 8 hours (overnight) | Never exceed 5 hours during the day — Bullmastiffs are prone to joint stiffness from prolonged confinement |
Whining protocol: If your puppy whines at night, first determine if they need to eliminate (take them out on leash, boring and quiet, no play). If they don't go, return them to the crate. Avoid letting them out while actively whining, as this teaches that whining opens the door. A snuggle puppy toy with a heartbeat simulator (SmartPetLove Snuggle Puppy, ~$40) can ease the transition for the first 2-3 weeks.
Teething Timeline and Relief Strategies
Bullmastiff puppies begin losing their 28 deciduous (baby) teeth around 12-16 weeks, with the process completing by approximately 6-7 months when all 42 adult teeth are in. The most intense chewing phase occurs between 4-6 months as adult canines and molars push through the gums.
Safe chew recommendations for Bullmastiff puppies:
- Kong Classic (Large or XL, red rubber): Stuff with wet puppy food or plain pumpkin and freeze for 4-6 hours — provides 30-45 minutes of soothing chewing (~$15-18)
- Benebone Wishbone (Large): Nylon chew infused with bacon flavor; durable enough for Bullmastiff jaw strength but replace when worn down significantly (~$18-22)
- Frozen washcloth: Wet a clean washcloth, twist into a rope, freeze — excellent for gum relief and essentially free. Supervise to prevent swallowing fabric
- Yak cheese chews (Himalayan Dog Chew, large): Hard, long-lasting, and digestible; microwave the end piece into a puff when it gets too small to prevent choking (~$15-20 for a multi-pack)
Avoid: Rawhide (choking and blockage risk), cooked bones (splintering), antlers (too hard — can fracture puppy teeth), and any chew toy smaller than your puppy's muzzle width.
Common Bullmastiff Puppy Problems and Solutions
Puppy Biting and Nipping
Bullmastiff puppies use their mouths to explore the world, and at 8-12 weeks, those needle-sharp baby teeth can surprise new owners. This is normal — but it must be redirected early, because a nipping 15-pound puppy becomes a nipping 80-pound adolescent.
Solution framework:
- Redirect: When puppy teeth touch skin, say "ouch" in a calm, firm tone (not a yelp, which can excite some puppies), then immediately offer an appropriate chew toy
- Time-out: If biting persists after 2-3 redirects, calmly stand up and leave the interaction for 15-30 seconds — this teaches that biting ends play
- Prevent rehearsal: Keep appropriate chews within reach in every room; anticipate bite triggers (overtiredness, overexcitement) and offer a chew before the biting starts
- Enforce naps: Overtired puppies bite more. If your 10-week-old has been awake for more than 2 hours, they likely need a crate nap — not more stimulation
Never use physical punishment, muzzle grabbing, or "alpha rolls." These methods increase fear and can trigger defensive aggression — particularly dangerous with a breed that will outweigh most adults in the household.
Destructive Chewing
Bullmastiff puppies are moderate-to-heavy chewers, and their jaw strength increases rapidly. Between 4-8 months, expect to lose shoes, remote controls, and baseboards if you're not proactive. Management is key: puppy-proof rooms by removing tempting items, provide a rotation of 5-7 approved chews to maintain novelty, and confine your puppy to a safe area (crate or puppy-proofed pen) when unsupervised.
Stubbornness and "Selective Hearing"
Bullmastiffs are intelligent but independent thinkers. They were bred to assess situations and act on their own judgment, which means they may not respond to commands with the eager compliance of a Labrador Retriever. This is not stupidity — it's breed character.
Training approach: Use high-value rewards (real chicken, hot dogs, cheese) and keep training sessions to 5-10 minutes maximum. Train in low-distraction environments first, then gradually add difficulty. End every session on a success. Enroll in a positive-reinforcement puppy class by 10-12 weeks — the structured environment and professional guidance are invaluable for a guardian breed.
First-Year Cost Breakdown
Bullmastiffs are expensive dogs to raise, primarily due to their size-driven food and medical costs. Here's a realistic budget for your puppy's first year in the US (2026 estimates):
| Category | Low Estimate | High Estimate | Details |
|---|---|---|---|
| Puppy purchase (from responsible breeder) | $2,000 | $4,500 | AKC-registered Bullmastiff from health-tested parents with OFA hip/cardiac clearances; rescue/adoption ranges $300-$700 |
| Veterinary care (vaccines, wellness exams, spay/neuter) | $800 | $1,800 | Includes initial exam ($65-120), vaccine series ($300-500), heartworm test/preventive ($150-250), spay/neuter ($400-800 for giant breed) |
| Food (giant-breed puppy formula) | $900 | $1,500 | Based on 5-7 cups/day at $0.40-$0.60/cup for premium brands; expect ~25-30 lb bags lasting 2-3 weeks |
| Supplies (crate, bed, bowls, leash, collar, toys) | $350 | $700 | 54" crate ($80-120), orthopedic bed ($80-200 — Bullmastiffs need joint support), stainless steel bowls ($25-40), martingale collar ($15-30) |
| Training (puppy class + basic obedience) | $200 | $600 | Group puppy class ($150-250 for 6-8 weeks); private sessions if needed ($75-150/session) |
| Preventive medications (flea/tick, heartworm) | $250 | $500 | Year-round heartworm prevention is essential; Simparica Trio or Interceptor Plus for large/giant breeds |
| Pet insurance (optional but recommended) | $600 | $1,200 | Monthly premiums $50-100 for giant-breed puppy; covers accidents, illness, hereditary conditions |
| Total first year | $5,100 | $10,800 | Ongoing annual costs after year one: approximately $2,500-$4,500/year |
Frequently Asked Questions
How often should I feed my Bullmastiff puppy at 8 weeks?
At 8 weeks, feed 3-4 meals per day, totaling approximately 2-3 cups of giant-breed puppy kibble daily. Split into roughly ¾ cup per meal if feeding 3 times. Consistent mealtimes (e.g., 7 AM, 12 PM, 5 PM) help regulate digestion and potty schedules.
When will my Bullmastiff puppy be fully potty trained?
Most Bullmastiff puppies are reliably house trained between 4-6 months of age. Some giant-breed individuals take up to 8 months due to slower bladder control development. Consistency with your outing schedule and reward system is the biggest factor in speed of training.
What vaccines does my Bullmastiff puppy need and when?
Core vaccines include DHPP at 6-8 weeks, 10-12 weeks, and 14-16 weeks, plus rabies at 12-16 weeks. Non-core vaccines (Bordetella, Leptospirosis, Lyme) depend on your region and lifestyle. Your veterinarian will tailor the protocol to your puppy's specific risk profile.
How do I stop my Bullmastiff puppy from biting?
Redirect every bite to an appropriate chew toy, use brief time-outs (15-30 seconds of no attention) when biting persists, and ensure your puppy is getting adequate sleep (18-20 hours/day at 8-12 weeks). Overtired puppies bite more. Never use physical punishment — it damages trust and can trigger defensive behavior in a guardian breed.
When can my Bullmastiff puppy go to the dog park?
Wait until at least one week after the final DHPP vaccine (approximately 17 weeks of age). Even then, dog parks are risky for young puppies due to unpredictable dog interactions and disease exposure. Structured puppy playgroups or arranged playdates with known, vaccinated dogs are safer alternatives during the first 6-8 months.
Do Bullmastiff puppies drool a lot?
Puppies drool less than adults, but you'll notice increased drooling starting around 4-6 months as the adult jaw structure develops and during teething. Keep a drool cloth handy — this is a lifelong breed characteristic, not something you can train away.
• ASPCA Animal Poison Control: (888) 426-4435 (24/7, consultation fee applies)
• Pet Poison Helpline: (855) 764-7661
• Your nearest 24-hour emergency vet clinic (save this number before you need it)
Raising a Bullmastiff puppy is a significant investment of time, money, and patience — but the reward is a deeply loyal, gentle companion who will guard your family with quiet confidence for the next 8-10 years. The work you put in during these first 12 months shapes the adult dog you'll live with for a decade. Start early, stay consistent, and don't hesitate to lean on your veterinarian and a certified positive-reinforcement trainer for support.
Aaron Whyte
All our authors care for dogs every day — read more of their work on the authors page.
