St Bernard Puppies: Complete Week-by-Week Care, Feeding & Training Guide

Bringing home a St Bernard puppy means welcoming what will become a 120–180 lb (54–82 kg) companion into your life. Giant-breed puppies have developmental timelines, nutritional requirements, and joint-health considerations that differ sharply from smaller breeds. A Great Dane or Mastiff puppy shares some of these traits, but the St Bernard's combination of rapid growth, moderate energy, and cold-weather heritage creates a unique care blueprint.

This guide walks you through every critical stage from 8 weeks to 12 months, with exact feeding amounts, vaccination dates, and realistic training timelines. If you are working with a veterinarian on a growth plan, use this as your reference companion.

When Should You Bring Your St Bernard Puppy Home?

Responsible AKC-affiliated breeders typically release St Bernard puppies between 8 and 10 weeks of age. Some breeders of giant breeds hold puppies until 10–12 weeks to complete an additional round of socialization and the second DHPP vaccine before the transition. Both windows are acceptable.

Avoid taking a puppy home before 8 weeks. The 6–8 week period is when littermates learn bite inhibition through play. Removing a St Bernard puppy too early often results in harder mouthing behavior that is more difficult to redirect in a 25 lb (11 kg) puppy with powerful jaws.

St Bernard Puppy Milestones: Week by Week

Weeks 4–8 (Breeder Stage)

During this period, your puppy is still with the breeder. Key developmental events include:

• Week 4–5: Introduction to gruel (puppy mush); first deworming (pyrantel pamoate)
• Week 6: First DHPP vaccine administered; socialization with novel surfaces and sounds begins
• Week 7–8: Bite inhibition learning peaks through littermate play; individual human handling increases

Ask your breeder for documentation of the first DHPP and deworming before pickup.

Weeks 8–12 (Home Transition)

Your St Bernard puppy will weigh approximately 20–35 lb (9–16 kg) at 8 weeks. Expect:

• Sleep: 18–20 hours per day (naps every 1–2 hours)
• Potty frequency: Every 30–60 minutes while awake; immediately after meals, naps, and play
• Biting/mouthing: Peak intensity — this is normal developmental behavior, not aggression
• Fear period: A primary fear imprint window occurs around 8–10 weeks; avoid traumatic experiences (loud noises, forced interactions, harsh corrections)

Weeks 12–16

• Weight: 40–65 lb (18–29 kg)
• Attention span: Extends to 5–8 minutes for short training sessions
• Second fear period: May appear around 12–14 weeks; previously confident puppies may suddenly show hesitation
• Teething onset: Deciduous (baby) teeth begin loosening around 14–16 weeks

Weeks 16–24

• Weight: 65–100 lb (29–45 kg) — growth is rapid but should remain steady, not explosive
• Teething peak: 4–6 months is the heaviest chewing period; permanent teeth erupt
• Energy: Moderate bursts of play (15–20 minutes) followed by long rest periods
• Socialization window closing: After 14–16 weeks, novel experiences require more repetition to build comfort

Months 6–12

• Weight at 6 months: 75–110 lb (34–50 kg)
• Weight at 12 months: 100–150 lb (45–68 kg) — males trend higher; full adult weight is not reached until 18–24 months
• Adolescence: Testing boundaries, selective hearing, and hormonal changes (if intact) are normal
• Joint care: Avoid forced running, jumping from heights, or repetitive stair climbing until growth plates close (typically 18–24 months for giant breeds)

St Bernard Puppy Feeding Schedule and Portions

Giant-breed puppies require a diet specifically formulated for large or giant breeds, with controlled calcium (1.2–1.5% on a dry matter basis) and moderate fat (12–17%) to prevent growth rates that stress developing joints. The Merck Veterinary Manual emphasizes that overfeeding is a leading cause of developmental orthopedic disease in giant breeds.

Feed a food that meets AAFCO nutrient profiles for growth or all life stages, with a statement indicating the food has been tested via feeding trials — not just formulated to meet nutrient profiles.

St Bernard Puppy Daily Feeding Guide (Large/Giant Breed Puppy Formula)

Age	Estimated Weight	Meals Per Day	Approx. Daily Kibble (cups)	Notes
8–12 weeks	20–35 lb (9–16 kg)	3–4	3–4 cups	Soak kibble in warm water if puppy struggles with hard pieces
3–4 months	35–55 lb (16–25 kg)	3	4–5 cups	Transition to dry kibble; monitor body condition score (BCS)
4–6 months	55–85 lb (25–39 kg)	2–3	5–7 cups	Reduce to 2 meals/day around 6 months
6–9 months	75–110 lb (34–50 kg)	2	6–8 cups	Split evenly between AM and PM; avoid exercise 1 hour before/after meals (bloat risk)
9–12 months	95–140 lb (43–64 kg)	2	7–9 cups	Consult your vet about transitioning to adult large-breed food at 12–18 months

Vaccination Schedule for St Bernard Puppies

Your puppy's vaccination timeline follows the AVMA-recommended core vaccine schedule, but giant breeds sometimes experience more post-vaccine lethargy. Plan low-activity days after each vaccine appointment.

St Bernard Puppy Vaccination Timeline

Age	Vaccine(s)	Notes
6–8 weeks	DHPP (Distemper, Hepatitis/Adenovirus, Parainfluenza, Parvovirus) #1	Typically given by breeder
10–12 weeks	DHPP #2; Bordetella (optional based on lifestyle); Leptospirosis #1 (if recommended by your vet)	Second DHPP is critical — do not delay
14–16 weeks	DHPP #3; Rabies (required by law in most US states); Leptospirosis #2	Final DHPP completes core puppy series; immunity develops ~2 weeks after last dose
12–16 months	DHPP booster; Rabies booster (1-year or 3-year depending on local law)	First annual boosters

Always consult your veterinarian to adjust this schedule based on local disease prevalence and your puppy's individual health status. Some vets in high-parvo areas may add a fourth DHPP at 18 weeks.

Socialization Window: Weeks 3–14

The primary socialization period for puppies closes between 12 and 14 weeks of age. For a breed as large as the St Bernard, early socialization is not optional — an undersocialized 150 lb dog is extremely difficult to manage in public settings. The goal is positive exposure, not flooding.

When can your puppy go outside and meet other dogs? You can carry your puppy in public spaces and visit controlled environments immediately after bringing them home. However, avoid dog parks, pet store floors, and areas with unknown dog traffic until 2 weeks after the final DHPP at 14–16 weeks (typically around 18 weeks of age). Playdates with fully vaccinated, known-healthy dogs in private yards are generally safe from 10–12 weeks onward — confirm with your veterinarian.

Potty Training Timeline and Realistic Expectations

St Bernard puppies are not inherently harder to house-train than other breeds, but their bladder capacity relative to body size develops on the same timeline as smaller dogs. A 30 lb (14 kg) St Bernard puppy does not have a proportionally larger bladder than a 30 lb adult Beagle.

Realistic potty training timeline:

• 8–12 weeks: Accidents daily are normal. Take puppy out every 30–60 minutes while awake, plus after every meal, nap, and play session.
• 3–4 months: Accidents drop to 1–3 per week with consistent scheduling. Puppy begins to signal (sniffing, circling, heading to the door).
• 4–6 months: Most St Bernard puppies are reliably house-trained during the day with a consistent schedule. Nighttime bladder control typically extends to 6–8 hours.
• 6–9 months: Full reliability for most puppies. Occasional accidents may occur during excitement, illness, or schedule disruptions.

When will your puppy be fully potty trained? Most St Bernard puppies achieve consistent daytime reliability between 4 and 6 months, and full reliability (including overnight) by 6–9 months. Giant-breed puppies may take slightly longer than smaller breeds due to the sheer volume of urine they produce — a 90 lb (41 kg) puppy's bladder output is substantial.

Crate Training Progression and Time Limits

A crate is essential for a St Bernard — not just for house training, but for safe confinement during adolescence when a bored 80 lb (36 kg) puppy can destroy furniture, ingest dangerous objects, or injure themselves. Purchase an XXL crate (48–54 inches long) with a divider panel so you can adjust the internal space as your puppy grows.

Crate Training Time Limits by Age

Age	Max Daytime Crate Time	Max Overnight Crate Time	Notes
8–10 weeks	1–2 hours	3–4 hours (expect 1–2 wake-ups)	Crate in your bedroom; cover with a breathable blanket
10–14 weeks	2–3 hours	5–6 hours	Begin moving crate to permanent location if desired
3–4 months	3–4 hours	6–8 hours	Midnight potty break may still be needed
4–6 months	4–5 hours	8 hours	Remove divider; give full crate space
6–12 months	5–6 hours	8–10 hours	Consider leaving crate door open as a "den" once chewing phase passes

Crate training progression:

1. Days 1–3: Feed all meals in the open crate. Toss high-value treats inside. Do not close the door.
2. Days 4–7: Close the door during meals. Open immediately when puppy finishes. Begin 30-second to 2-minute closed-door sits while you are in the room.
3. Week 2: Extend closed-door time to 5–10 minutes while you sit nearby. Step out of the room for 30 seconds, then return before puppy vocalizes.
4. Week 3–4: Leave the room for 5–15 minutes. Return calmly — do not make a big greeting. Build duration gradually.
5. Ongoing: Always provide a long-lasting chew (bully stick, frozen stuffed Kong) when crating. Never use the crate as punishment.

Teething Timeline and Relief Strategies (3–6 Months)

St Bernard puppies begin losing deciduous teeth around 14–16 weeks, with permanent teeth fully erupted by 6–7 months. During the 3–6 month window, expect:

• Increased chewing on everything — furniture legs, shoes, baseboards, fingers
• Occasional drooling with small amounts of blood (normal)
• Reluctance to eat hard kibble for 1–2 days when a tooth is actively loosening
• "Puppy breath" odor shifting to a stronger smell during active eruption

Safe chew recommendations for giant-breed puppies:

• Kong Classic (XL or XXL): Stuff with plain yogurt and banana, freeze overnight. The cold soothes inflamed gums.
• Benebone Puppy (large): Softer nylon formula designed for developing teeth; replace when deep grooves appear.
• Frozen carrots or apple slices (no seeds): Low-calorie, safe, and provide cold relief. Supervise to prevent choking on large pieces.
• Bully sticks (6-inch, thick): Highly digestible single-ingredient chew. Hold the last 2 inches with pliers or a bully stick holder to prevent choking.

Avoid: Hard antlers, cooked bones (splinter risk), ice cubes (can crack developing teeth), and rawhide from unverified sources. If you notice a retained baby tooth (a permanent tooth erupting alongside a baby tooth that hasn't fallen out), mention it at your next vet visit — extraction may be needed to prevent misalignment.

Common St Bernard Puppy Problems and Solutions

Puppy Biting and Nipping

St Bernard puppies mouth and bite during play — this is how they explore the world and learn bite inhibition. However, a giant-breed puppy's bite force increases dramatically between 8 weeks and 6 months, making early intervention essential.

How to stop puppy biting/nipping:

• Redirect: When teeth touch skin, say "ouch" in a calm, medium-pitch voice, then immediately offer an appropriate chew toy. Praise enthusiastically when they chew the toy.
• Withdraw attention: If redirecting fails, stand up and step behind a baby gate for 15–20 seconds. Return and try again. This teaches "teeth on skin = fun stops."
• Never use physical punishment: Holding the mouth shut, alpha rolls, or nose tapping increase fear and can escalate biting. Force-free, positive reinforcement methods are the only approach recommended by certified behaviorists.
• Enrichment over correction: A puppy biting out of boredom needs more mental stimulation — food puzzles, scent games, and short training sessions reduce mouthing more effectively than discipline.

Whining and Crying (Especially in the Crate)

St Bernard puppies are social and vocal when separated. Differentiate between needs-based whining (potty, pain, too hot/cold) and protest whining (boredom, wanting attention).

• If puppy was recently out and fed, and the crate is comfortable, wait out protest whining. Rewarding it by letting puppy out reinforces the behavior.
• Set an alarm for overnight potty breaks based on age (every 3–4 hours at 8–10 weeks; every 5–6 hours at 3–4 months).
• Provide white noise or a ticking clock near the crate to mimic littermate sounds.

Destructive Chewing

Beyond teething, St Bernard puppies chew from boredom and under-stimulation. A puppy left alone for 4 hours without enrichment will find something to destroy.

• Rotate toys weekly to maintain novelty (keep 4–5 out, store the rest, swap every 5–7 days)
• Provide at least one food-dispensing toy per crating session
• Puppy-proof one room beyond the crate area for supervised free time — remove shoes, cords, and small objects

First-Year Cost Breakdown for a St Bernard Puppy

Giant-breed puppies cost significantly more to raise than small or medium breeds, primarily due to food volume and the higher cost of appropriately sized supplies. Below is a realistic first-year budget based on 2026 pricing.

St Bernard Puppy First-Year Cost Estimate (US Average)

Category	Low Estimate	Mid Estimate	High Estimate	Details
Purchase/Adoption	$300 (rescue)	$1,800 (breeder)	$3,500 (show-line breeder)	Reputable breeders health-test parents (OFA hips, cardiac, eye clearance)
Veterinary (wellness + vaccines)	$600	$900	$1,400	3 puppy visits, vaccines, fecal tests, heartworm prevention, spay/neuter
Food (12 months)	$900	$1,400	$2,200	Large/giant breed puppy formula; premium brands cost more per bag but may require fewer cups
Supplies (crate, bed, bowls, leash, collar, gate, toys)	$400	$700	$1,200	XXL crate, orthopedic bed, stainless steel bowls, 6-ft leash, martingale collar
Training (group classes or private)	$150	$400	$1,000	Puppy kindergarten (6–8 weeks); private sessions for specific issues cost $80–$150/session
Preventive medications (heartworm, flea/tick)	$250	$400	$600	Dosing is weight-based; giant-breed doses cost more (e.g., Heartgard Plus for 51–100 lb)
Grooming	$100	$300	$600	St Bernards need regular brushing; professional grooming 2–4× per year for bathing and nail trims
Pet insurance (optional)	$600	$900	$1,400	Monthly premiums $50–$120 for giant breeds; covers accidents, illness, some plans cover hereditary conditions
Total First Year	$3,300	$6,800	$11,900	Does not include emergency vet visits (budget $500–$2,000+ for unexpected illness or injury)

Frequently Asked Questions

How often should I feed my St Bernard puppy at 10 weeks old?

At 10 weeks, feed 3–4 meals per day. Divide the daily total (approximately 3–4 cups of giant-breed puppy kibble) evenly across meals. Consistent meal timing supports potty training predictability and helps monitor appetite changes that could signal illness.

Should I feed large-breed or giant-breed puppy food?

Look for formulas specifically labeled for large or giant breeds. These contain controlled calcium-to-phosphorus ratios and moderate calorie density to support slower, steadier growth. Brands like Royal Canin Giant Puppy, Purina Pro Plan Large Breed Puppy, and Hill's Science Diet Large Breed Puppy are formulated with growth-rate management in mind. Your veterinarian can recommend the best option for your puppy's specific growth curve.

When should I start formal training classes?

Enroll in a positive-reinforcement puppy kindergarten class as soon as your puppy has had their second DHPP vaccine (typically around 10–12 weeks). Many training facilities require proof of at least two DHPP doses. Early classes focus on socialization, basic cues (sit, recall, loose-leash walking), and bite inhibition — all critical for a breed that will outweigh most adult humans within a year.

How much exercise does a St Bernard puppy need?

Follow the "5 minutes per month of age" guideline for structured walks: a 4-month-old puppy gets approximately 20 minutes of leash walking per day, split into two sessions. Free play in a fenced yard can supplement this, but avoid forced running, agility equipment, or repetitive fetch on hard surfaces until growth plates close at 18–24 months. St Bernards are moderate-energy dogs — they need mental stimulation (training, scent work, puzzle toys) more than intense physical exercise during puppyhood.

My St Bernard puppy seems lazy — is that normal?

Yes. St Bernard puppies sleep 16–20 hours per day and have relatively short play bursts compared to sporting or herding breeds. However, lethargy accompanied by pale gums, refusal to eat, vomiting, or collapse is not normal laziness — contact your veterinarian immediately, as these can indicate anemia, infection, or cardiac issues.