Mastiff has high obesity risk, needs regular exercise and food control to maintain healthy weight.

Rat Terrier has average risk of obesity, needs daily walks and quality diet to maintain healthy weight.

Affectionate
Cheerful
Intelligent
Protective
Alert
Courageous
Loyal

Affectionate
Inquisitive
Loving
Alert
Lively

Mastiffs are moderate shedders, but regular brushing can reduce shedding and maintain coat health.

Rat Terriers are heavy shedders, but regular brushing can help manage shedding and promote a healthy coat.

Choose a Mastiff if you want a top-notch watchdog. This breed takes guarding seriously, and may not require much training, though obedience or guard dog training can improve their skills.

Rat Terriers are decent watchdogs - they'll alert their owner if something seems amiss.

England

United States

Molosser-type Dogs

Terrier, Whippet, Greyhound, Beagle

American Canine Registry
American Kennel Club
America's Pet Registry
Canadian Kennel Club
Dog Registry of America Inc.
Federation Cynologique Internationale
Kennel Club of Great Britain
North American Purebred Registry, Inc.
American Canine Association, Inc.
Australian National Kennel Council
Continental Kennel Club
National Kennel Club
New Zealand Kennel Club
United Kennel Club

American Canine Registry
American Kennel Club
America's Pet Registry
Dog Registry of America Inc.
North American Purebred Registry, Inc.
American Canine Association, Inc.
Continental Kennel Club
National Kennel Club
United Kennel Club

Working (AKC:1885)
Guardian Dog (UKC)

Terrier (AKC:2013 & UKC)

A Mastiff can have a litter of 10-12 puppies on average. However, it's worth noting that the size of the litters can vary greatly. Factors that can influence litter size include the health of the mother, breeding history, and genetics.

A Rat Terrier can have a litter of 15-18 puppies on average. However, it's worth noting that the size of the litters can vary greatly. Factors that can influence litter size include the health of the mother, breeding history, and genetics.

Mastiffs typically have low vet costs due to their good health, but it's important to monitor their health and seek vet care when necessary.

While the Rat Terrier breed is generally healthy, occasional vet check-ups are still necessary to address any health concerns.

Gastric Torsion
Hip Dysplasia

Patellar Luxation
Elbow Dysplasia
Hip Dysplasia

Entropion
Ectropion
Elbow Dysplasia
Progressive Retinal Atrophy
Retinal Dysplasia
Hypothyroidism

Demodectic Mange
Epilepsy
Legg-Calve-Perthes Disease
Color Dilution Alopecia
Teeth Issues

Eye
Hip
Elbow
Thyroid Tests
X-Rays
Eye Examination

Hip
Elbow
X-Rays
Dental Examination
Physical Examination
Skin Evaluation

Mastiffs are a good choice for a low-key lifestyle due to their low energy levels.

Rat Terriers thrive on an active lifestyle due to their high-energy nature.

Mastiff has average social needs and is less independent than other breeds.

Rat Terrier has very high social needs and requires regular mental and physical stimulation, a job or purpose, and companionship.

Mastiffs need only a small amount of physical activity, ideal for busy or elderly people or those with limited space.

Rat Terriers need moderate physical activity and are great for families and active individuals.

Mastiffs are known for their relaxed and calm nature and enjoy long periods of sleep.

Rat Terriers are active and require sufficient sleep to stay healthy.

Mastiff excessively drools, consider a different breed if not appealing.

Rat Terrier minimally drools, ideal for those who dislike drool marks on clothing.

Mastiffs are typically quiet and only bark when needed, such as to alert their owner or when in distress.

Rat Terriers bark moderately when necessary and may also bark due to certain triggers like fear, alarm, boredom, greeting, separation anxiety and compulsive barking.

Snuggling, Sleeping, Eating, Eating Snacks, Walk, Catch treats, Nap, Walking, Tug-of-war, People petts, Chase, Fetch, Running

Chase, Sniff, Bark, Trot, Fetch, Tug-of-war, Run, Playing, Chasing, Jumping, Running, Walking, Play, Walk, Play keep away

The Mastiff has low grooming needs and is easy to maintain.

The Rat Terrier is a low-maintenance breed that doesn't require much grooming.

Mastiffs are average in obedience intelligence but have a high IQ and may cause trouble if left unsupervised.

Rat Terrier is a very intelligent and trainable breed.

Mastiffs have average emotions and adapt well to different situations.

This breed is sensitive and requires gentle handling and a calm home environment.

Mastiffs are good apartment dogs as long as they get enough exercise and stimulation outside of the apartment.

Rat Terriers make excellent apartment dogs, being fairly active indoors and not requiring a yard.

Mastiffs are very friendly with cats and make great companions for them.

Rat Terriers are good with cats, but early training is needed to prevent chasing behavior.

Mastiffs are average in their friendliness towards other dogs, and socialization can help.

Rat Terriers are friendly and active companions, and can be good family pets, though their friendliness towards other dogs may vary.

Mastiffs are averagely friendly around strangers but benefit from early socialisation.

Rat Terriers are friendly but may bark at strangers, and training is easy due to their intelligence.

Mastiffs are not known for being a highly playful breed.

Rat Terriers have an average level of playfulness, enjoying playtime like most dogs but not excessively so.