Mastiff Bloodhound Mix: The Complete Breed Profile & Care Guide

If you've ever watched a giant, loose-skinned hound lumber across a dog park with surprising grace, you may have been looking at a Mastiff Bloodhound mix — sometimes called a "Mastiff Hound" in rescue listings. This designer cross combines the English Mastiff's calm guardian instinct with the Bloodhound's legendary scent-drive and gentle disposition. The result is one of the largest companion dogs you'll encounter, often tipping the scales well past 120 pounds, with a personality that's equal parts couch potato and determined tracker.

Before you bring home a puppy or rescue dog with this lineage, you need hard data on their adult size, predictable health risks, real exercise requirements, and the annual budget this giant breed demands. This profile gives you the specifics.

Quick Breed Snapshot: Mastiff Bloodhound Mix

Attribute	Details
Size Class	Giant (100–180+ lb / 45–82+ kg)
Height (at shoulder)	25–30 inches (64–76 cm)
Weight Range	100–180 lb (45–82 kg); males typically heavier
Lifespan	7–10 years
Coat Type	Short, dense, smooth; moderate shedding year-round
Energy Level	Low-to-moderate; bursts of scent-driven stamina
Grooming Frequency	Weekly brushing; daily wrinkle care if inherited
Family Fit	Best for experienced owners with space; gentle with children when socialized
Apartment Friendly?	Poor — needs yard access and ground-floor or house living

Origin & Breed History

The Mastiff Bloodhound mix is not an AKC-recognized breed — it's a deliberate or accidental cross between two ancient lineages. The English Mastiff, documented in Britain since at least the Roman invasion era (circa 55 BC), was historically used as a war dog, estate guardian, and later a companion protector. The Bloodhound traces back to medieval Belgian monasteries (the St. Hubert Hound, circa 7th–8th century AD) and was refined in England and France as an unmatched scent-tracking dog — a breed whose nose carries roughly 300 million olfactory receptors compared to a human's 5 million.

Crosses between these two breeds emerged primarily in the United States during the late 1990s and early 2000s, driven by owners seeking a large guardian dog with Bloodhound-level scent ability for property protection and search-and-rescue interest. Most Mastiff Bloodhound mixes today come from intentional first-generation (F1) breedings or appear in large-breed rescue programs. There is no established multigenerational breeding program, so trait inheritance varies significantly even within a single litter.

Physical Characteristics: How Big Does a Mastiff Bloodhound Get?

This is a giant-class dog with no ambiguity. Adult males typically stand 27–30 inches (69–76 cm) at the shoulder and weigh 130–180 lb (59–82 kg). Females generally measure 25–28 inches (64–71 cm) and weigh 100–145 lb (45–66 kg). Some individuals exceeding 200 lb (91 kg) have been documented when the Mastiff parent carries heavy English Mastiff genetics.

Physically, expect a broad, massive head with a pronounced stop, long pendulous ears (inherited from the Bloodhound side), and loose, wrinkled skin around the face and neck. The body is muscular and deep-chested with a long, tapering tail. Coat colors include fawn, brindle, black-and-tan, liver, red, and various combinations. The coat itself is short and smooth — typically 1–1.5 inches in length — with a dense undercoat that sheds moderately throughout the year and heavily during spring and fall seasonal blows.

Temperament & Personality: 5 Core Traits

1. Calm Indoors, Determined Outdoors. Inside the home, a Mastiff Bloodhound mix is typically sedate — happy to sprawl on a large bed or rug for hours. But the moment they catch an interesting scent on a walk, they switch into a focused, almost trance-like tracking mode. Expect your dog to pull toward interesting smells with surprising force given their mass. One owner described it as "being towed by a slow freight train."

2. Gentle with Familiar People. Despite their intimidating size, well-socialized Mastiff Bloodhounds are famously soft-mouthed and patient. They tend to lean against their owners for physical contact and are slow to react to minor provocations. This makes them surprisingly safe around children they know — though their sheer mass means a clumsy tail wag can knock over a toddler.

3. Reserved with Strangers. The Mastiff guardian instinct surfaces here. These dogs typically don't bark aggressively at visitors but will position themselves between their owner and an unfamiliar person, watching closely. They warm up once their owner signals acceptance, but the initial assessment period can last several minutes.

4. Vocal in Specific Contexts. The Bloodhound bay — a deep, resonant howl — can emerge when they're on a scent trail, left alone too long, or hear distant sirens. This isn't nuisance barking; it's a breed-specific vocalization that carries for long distances and will be heard by neighbors. In apartments or close-quarter housing, this trait is problematic.

5. Stubborn but Not Defiant. Training sessions that don't involve scent work or food motivation will hit a wall. These dogs aren't unintelligent — they simply don't see the point of repetitive obedience drills without meaningful reward. This is a working-line trait, not a flaw.

Exercise & Activity Needs

The Mastiff Bloodhound mix requires 45–75 minutes of structured activity per day, split across two sessions to protect their joints. Here's what that looks like in practice:

Activity Type	Duration	Frequency	Notes
Leash walking (sniff-heavy)	25–35 minutes	Twice daily	Allow extensive sniffing — this is mental stimulation for scent breeds
Scent tracking games	15–20 minutes	3–4x per week	Hide treats or toys in yard; drag a scent trail with a rag
Supervised yard time	20–30 minutes	Daily	Fenced yard required (minimum 6-foot fence — they can clear shorter fences when motivated)
Swimming (if interested)	10–15 minutes	1–2x per week	Low-impact joint exercise; not all individuals enjoy water
Avoid: jogging, agility, repetitive jumping	N/A	N/A	High-impact activity risks joint injury in giant breeds under 24 months and throughout life

Critical note on puppy exercise: Giant-breed puppies should not engage in forced exercise (running, long hikes) until growth plates close — typically 18–24 months for dogs of this size. The general guideline is 5 minutes of structured walking per month of age, twice daily (e.g., a 4-month-old puppy gets 20-minute walks). Free play on soft surfaces is acceptable beyond this.

Health Risks: What Problems Is This Breed Prone To?

The Mastiff Bloodhound mix inherits health predispositions from both parent breeds. Giant-breed dogs face a compressed health timeline — conditions that appear at age 8 in a Labrador may appear at age 4 or 5 in a 150-pound dog. Always consult your veterinarian for breed-appropriate screening protocols.

Condition	Prevalence	Onset	Key Signs	Estimated Treatment Cost
Gastric Dilatation-Volvulus (GDV/Bloat)	High risk — deep-chested giant breeds; estimated 20–40% lifetime risk without preventive gastropexy	Any age, most common 4–7 years	Distended abdomen, unproductive retching, restlessness, collapse	$3,000–$7,000 emergency surgery; often fatal without intervention
Hip Dysplasia	~25–35% in giant breeds (OFA data for Mastiffs: 23.7% dysplastic)	Signs from 6 months; confirmed by 24 months	Hind-end bunny hopping, reluctance to rise, stiffness after rest	$3,500–$7,000 per hip for total hip replacement
Elbow Dysplasia	~15–20% in Mastiff lineage	4–10 months typically	Front leg lameness, elbow held away from body	$1,500–$4,000 surgical correction
Ectropion/Entropion (Eyelid Conditions)	Common when Bloodhound facial structure is inherited; estimated 30%+ in loose-skinned individuals	6 months–3 years	Excessive tearing, eye redness, corneal ulcers, visible eyelid rolling	$500–$1,500 per eye for surgical correction
Dilated Cardiomyopathy (DCM)	Elevated risk in giant breeds; Mastiffs listed among predisposed breeds	Typically 5–8 years	Coughing, exercise intolerance, abdominal swelling, fainting	$200–$500/month ongoing medication management

Preventive screening schedule recommended for giant breeds:

• 12–24 months: OFA/PennHIP hip and elbow radiographs
• Annually after age 3: Cardiac auscultation and echocardiogram if murmur detected
• Annually after age 5: Full blood panel including thyroid function
• Prophylactic gastropexy: Discuss with your vet at time of spay/neuter — this surgical tacking of the stomach to the body wall reduces GDV risk by approximately 85% and adds roughly $300–$600 to the spay/neuter procedure cost

Training & Intelligence

Trainability rating for the Mastiff Bloodhound mix: moderate (3/5). These dogs are intelligent but independently motivated. They learn quickly when training aligns with their scent-drive instincts but will disengage from repetitive drills that lack meaningful reward.

Recommended training approach: Positive reinforcement with high-value food rewards (freeze-dried liver, boiled chicken, commercial training treats with strong aroma). Force-free, reward-based methods are essential — these dogs are sensitive to harsh correction despite their size, and aversive tools like shock collars or prong collars will damage trust and can trigger fear-based reactivity in a dog large enough to be genuinely dangerous if frightened.

Priority training areas:

1. Loose-leash walking (start by 10 weeks): A 150-lb dog that pulls is unmanageable. Use a front-clip harness (e.g., Ruffwear Front Range or Rabbitgoo No-Pull) from puppyhood. Reward heel position with high-value treats every 2–3 steps initially.
2. Reliable recall with long-line practice: The Bloodhound scent instinct means off-leash reliability is extremely difficult. Practice recall on a 30-foot long line for the dog's entire first year. Most individuals of this mix should never be trusted fully off-leash in unfenced areas.
3. Impulse control around food: Giant breeds prone to bloat must learn to eat slowly. Use a slow-feeder bowl (e.g., Outward Hound Fun Feeder) and train a solid "wait" cue before meals.
4. Handling desensitization: Vet visits, nail trims, and grooming require a dog this size to cooperate willingly. Practice paw handling, ear inspection, and muzzle touching daily from puppyhood with treat pairing.

Grooming Requirements

The short coat is deceptively low-maintenance, but the skin folds demand consistent attention:

• Brushing: Once weekly with a rubber curry brush (e.g., Kong ZoomGroom, ~$10) or a medium-bristle brush. During seasonal shedding (spring and fall), increase to 2–3 times per week. A Furminator deShedding tool for large short-hair dogs can manage undercoat blow-out efficiently.
• Wrinkle cleaning: If your dog inherits Bloodhound-style facial folds, clean them daily with a soft, damp cloth or unscented pet wipe (e.g., Earthbath Facial Wipes). Dry thoroughly. Apply a thin layer of veterinary-recommended barrier balm (e.g., Musher's Secret or Squishface Wrinkle Paste) to prevent moisture buildup and yeast overgrowth. Wrinkle infections (intertrigo) are painful, expensive ($150–$400 per vet visit), and entirely preventable.
• Ear cleaning: Long, pendulous ears trap moisture and debris. Clean weekly with a veterinary ear cleaner (e.g., Epi-Otic Advanced). Lift the ear flap, fill the canal, massage the base for 20 seconds, and let the dog shake. Wipe visible debris with cotton balls — never insert cotton swabs into the ear canal.
• Nail trimming: Every 3–4 weeks. Giant-breed nails grow thick and can split painfully if overgrown. A Dremel 7300-PT pet nail grinder ($30–$40) is easier on thick nails than manual clippers and reduces the risk of cutting the quick.
• Bathing: Every 6–8 weeks or as needed. Use a gentle, oatmeal-based dog shampoo. Drool staining on the chest and jowls may require spot-cleaning between baths.

Family Suitability: Kids, Pets, and Living Space

With children: Well-socialized Mastiff Bloodhound mixes are patient and gentle with children in their own family. However, their massive size creates an inherent safety concern — a 150-lb dog turning quickly can knock down a child under age 8. Always supervise interactions, teach children not to climb on the dog or disturb them while eating, and provide the dog with a retreat space (a large crate or gated room) where children cannot follow.

With other pets: Generally good with other dogs when socialized from puppyhood. The Mastiff lineage tends toward same-sex dog aggression in intact males — spaying/neutering reduces this risk. With cats, early exposure is key; an adult Mastiff Bloodhound mix with no cat history may have a strong prey response, particularly if the Bloodhound tracking instinct activates. Introduce slowly over 2–4 weeks with the dog on leash.

Apartment living: Poor fit. Beyond the space issue, consider elevator logistics with a 160-lb dog, stair stress on giant-breed joints, and the Bloodhound bay that will disturb neighbors. A single-family home with a fenced yard (minimum 6-foot fencing) is strongly recommended. If apartment living is unavoidable, a ground-floor unit with direct outdoor access is the minimum acceptable arrangement.

Cost of Ownership: Purchase Price and Annual Budget

Giant-breed dogs are expensive — there's no way around it. Here's a realistic breakdown based on 2026 pricing:

Puppy purchase price:

• From a responsible breeder (health-tested parents, OFA certifications, early neurological stimulation): $1,500–$3,500
• From a rescue or breed-specific large-dog rescue: $200–$600 (often includes spay/neuter, initial vaccines, and microchip)
• Avoid any breeder advertising "rare colors" at premium prices or unable to provide OFA/PennHIP documentation for both parents

First-year estimated costs:

Expense	Estimated Cost
High-quality giant-breed puppy food (e.g., Royal Canin Giant Puppy, Purina Pro Plan Large Breed) — 50–60 lb/month at peak growth	$1,800–$2,800
Veterinary care (initial vaccine series, spay/neuter with prophylactic gastropexy, wellness exams, fecal tests)	$1,200–$2,200
Preventive medications (heartworm: Heartgard Plus for 101+ lb dogs; flea/tick: NexGard or Bravecto)	$400–$650
Supplies (XL crate, heavy-duty bed, front-clip harness, bowls, leash, grooming tools)	$400–$800
Training (group puppy class + 4–6 private sessions for leash manners)	$400–$900
Pet insurance (recommended for giant breeds; e.g., Trupanion, Healthy Paws)	$900–$1,500/year
Total first year	$5,100–$8,850

Ongoing annual costs (years 2+): $3,500–$6,500 per year, with food and preventive medications comprising the largest ongoing expenses. Budget an additional emergency fund of $2,000–$5,000 for unexpected health events — giant breeds have higher emergency surgery costs due to anesthesia requirements and medication dosing by weight.

Is the Mastiff Bloodhound Mix Right for First-Time Owners?

Honestly, this is not an ideal first dog. The combination of extreme size, scent-driven stubbornness, significant grooming needs (wrinkle care), and elevated health risks demands an owner who has experience managing large dogs, understands giant-breed nutrition and growth-rate management, and can afford the veterinary costs. First-time owners who are determined to pursue this mix should commit to working with a certified professional dog trainer (CPDT-KA or IAABC-certified) for at least the first year and should strongly consider adopting an adult dog (age 3+) whose temperament and health are already established rather than navigating puppyhood with a giant breed.

Frequently Asked Questions

This article is for informational purposes only and does not replace professional veterinary advice. Always consult your veterinarian for health, nutrition, and medication decisions specific to your dog.