80-100 lbs
Clumber Spaniel

The Clumberstiff is an intentional hybrid; a cross between the Clumber Spaniel, a heavy boned hunting Spaniel, and the Bullmastiff, a dog bred to guard and protect large estates. These dogs are generally quite affectionate and sometimes even clown-like with their families, but they may be a bit reserved with strangers. Socialization, early training, and proper nutrition are doubly important for these large animals in order to prevent aggression and to ensure that their bones do not grow too quickly. Although large, these dogs are relatively quiet and have only moderate exercise requirements, making it surprisingly easy for them to adapt to apartment life.

purpose Purpose
Companion, Guarding, Hunting
history Date of Origin
ancestry Ancestry
Clumber Spaniel, Bullmastiff

Clumberstiff Health

Average Size
Male Clumberstiff size stats
Height: 22-24 inches Weight: 90-110 lbs
Female Clumberstiff size stats
Height: 21-23 inches Weight: 80-100 lbs
Major Concerns
  • Hip Dysplasia
  • Bloat
  • Eye Problems
Minor Concerns
  • Elbow Dysplasia
  • Hypothyroidism
  • Obesity
Occasional Tests
  • Eye
  • Hip
  • Elbow
  • Skeletal
  • Thyroid Tests
  • Physical Examination

Clumberstiff Breed History

The Clumberstiff is a designer dog, and intentional crossbreed between the Bullmastiff, a guarding breed, and the Clumber Spaniel, a gun dog, adept at flushing and retrieving game. The Bullmastiff is the only guarding breed dog that was developed in England and was originally a crossbreed itself. A hybrid of the English Bulldog and the English Mastiff, these imposing dogs were developed to be guardians of the grounds and game on large English estates, protecting them from poachers and thieves. Mastiffs proved too large and too slow for the job, and the Bulldogs of the time didn’t have the restraint required to prevent mauling of the poachers. The combination of the two, the Bullmastiff, is a smaller, more agile breed than the Mastiff and a larger and more controlled animal than the Bulldog of the time. The Clumber Spaniel was also developed in England, but the history as to which breeds were used in conjunction with traditional Spaniel breeds is murky at best. It is believed that the Clumber Spaniel breed was developed towards the end of the 18th century and the beginning of the 19th century, possibly employing dogs like Basset Hound, although the records of the breeds that were used to create the Clumber Spaniel are non-existent. The most likely scenario is that they were developed for function rather than form by the gamekeepers that worked with the dogs near that turn of the century. The Clumber was named in honor of Clumber Park, an estate of nearly four thousand acres that was owned by the Duke of Newcastle. The Clumber Spaniel dogs were a very popular hunting breed and were frequently depicted in artwork from this era as well as having the honor of being one of the first nine breeds of dog recognized by the American Kennel Club when it was formed in 1883.

Clumberstiff Breed Appearance

This crossbreed is a large animal, although not typically as large as the Bullmastiff breed. Both parent breeds are solid, substantial animals, with large, flat heads and muzzles that are both broad and deep. They will typically have round or oval shaped eyes that range from amber to dark brown and may have a diamond or V-shaped rim and their ears will be triangular, although they may sit to the sides of the head or high on top of it. The Clumber Spaniel is considerably longer than they are tall, with fairly short legs, where the Bullmastiff has a squarer silhouette and longer legs. The Clumberstiff may inherit any of these traits, but in most cases, they will be slightly longer than they are tall but not as low to the ground as the Clumber Spaniel. Clumberstiffs usually have a double coat, with a dense undercoat overlayed by a short, weatherproof outer layer that can be made up of either hard or soft hairs, although some will inherit the short single layer coat of the Bullmastiff. 

Clumberstiff Breed Maintenance

These hybrids are somewhat simple to handle when it comes to grooming as their short coat is typically fairly manageable. Although they require regular brushing with a curry comb or soft bristle brush to control shedding and properly distribute their body oils, monthly baths are usually adequate for these dogs unless they get dirty or muddy. If your dog has inherited the folds or wrinkles characteristic of the Bullmastiff, the folds of skin should be checked regularly to ensure they have not trapped any moisture or dirt in them as this can lead skin irritation and a foul odor may develop. They shed moderately year round, and Clumberstiffs with a double coat tend to shed more heavily than those with a single coat. 

Clumberstiff Temperament

This is a fairly large animal that tends to be more laid back than active with a dash of a clownish nature. They tend to be affectionate and mellow canines with their families, both with children and with adults, although they can be a bit stubborn. Some Clumberstiffs may have a little bit of a rambunctious streak while they are still young that makes them an inappropriate companion for the very young, although they tend to grow out of it by the time they reach maturity at around three years old. These dogs are very large and powerful, and interactions between young children and dogs should be closely supervised to ensure the safety of all involved. Their interactions with other animals can be variable as the Clumber Spaniel tends to be quite sociable, but the Bullmastiff is known to sometimes display aggression towards other dogs. For this reason, socialization is particularly important for this crossbreed, and training should start early. 

Clumberstiff Activity Requirements

Although this canine is unlikely to come begging for an exercise session, they do need to be active for at least 40 to 60 minutes each day to maintain their health, particularly as they have a tendency towards obesity. It is important to remember to keep exercise sessions shorter during your dog’s formative years by breaking them up throughout the day as well as ensuring that your dog does not rough-house or jump from a significant height as this can damage the still forming bones and joints, particularly for those that have inherited the longer back of the Clumber Spaniel. Swimming may be an especially positive experience for these dogs as it will help build mass and cardiovascular health without stressing the joints. Mature Clumberstiffs will do better in an apartment setting than younger ones due to their energy levels and although this crossbreed prefers the room that a house provides, they should be able to adapt to apartment life fairly well as they don’t tend to bark much and require only moderate exercise.

Clumberstiff Owner Experiences

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