Irish Mastiff

105-165 lbs
Irish Wolfhound
The Irish Mastiff is the hybrid of two of the largest, tallest breeds of canine known to man, the Mastiff, also known as the English Mastiff, and the Irish Wolfhound. This crossbreed can reach as high as three feet tall at the shoulder and typically weighs greater than a hundred pounds, but both parent breeds have been referred to as gentle giants, at least when it comes to their family, and they are generally easy going animals that fit in well with most families. Due to their laid-back nature, these dogs can adapt to an apartment setting if some considerations are taken to make sure they have enough room to move around furniture and through hallways and at least one patch of floor near the rest of the family that is big enough to sprawl out on. In general, however, they are happier living in a larger home with a fenced in yard.
Family companion, guard dog
Date of Origin
Irish Wolfhound and Mastiff

Irish Mastiff Health

Average Size
Male Irish Mastiff size stats
Height: 31-36 inches Weight: 120-180 lbs
Female Irish Mastiff size stats
Height: 29-34 inches Weight: 105-165 lbs
Major Concerns
  • Hip And Elbow Dysplasia
  • Bloat
  • Heart Conditions
Minor Concerns
  • Osteosarcoma
  • Wobbler's Syndrome
  • Eye Diseases and Disorders
Occasional Diagnoses
  • Hypothyroidism
  • Urolithiasis
  • Portosystemic Shunts
Occasional Tests
  • Eye Examination
  • Biopsy
  • X-ray imaging
  • Electrocardiogram

Irish Mastiff Breed History

This hybrid is a combination of two giant breeds from ancient history, the massive and powerful English Mastiff and the giant, galloping Sighthound known as the Irish Wolfhound. Mastiff-like dogs have been depicted in ancient artwork from Asia dating as far back as 2500 BC, and these substantial canines were even recorded as marching alongside Hannibal and his armies as they crossed the Alps. Because they are consummate guard dogs and hunting companions, they became favored by landholders and peasants alike for their easy-going and steadfast nature when they reached England. Unfortunately, World Wars I and II had an extremely negative impact on the canine population of Europe’s particularly in regards to larger sized dogs like English Mastiffs. They were often placed in double jeopardy during the wars because they were too big to easily keep fed during rationing and they were also considered useful on the front lines, pulling munitions carts and most likely resulting in many deaths. By the time both of the wars had ended the English Mastiff was nearly extinct, at one point down to just fifteen dogs known dogs worldwide that were able to contribute to the gene pool. Mastiff puppies were imported to England from scant populations in both the United States and Canada to help revive the breed, and they have since seen a resurgence in popularity, becoming the 28th most popular breed according to the AKC. The Irish Wolfhound is also an ancient breed, noted as far back in history as 391 AD, when several of them were gifted to the Royal Consul from Ireland. They were used to hunt down very large prey such as elk, boar, and, of course, the now extinct Irish Wolf that they were named for. Once the last of the wolves was killed in 1786, the population of Irish Wolfhounds also began to dwindle and by the middle of the 1800s, there were very few left. If it hadn’t been for the work of a Captain George Augustus Graham, a Scotsman enlisted in the British army, they may have gone extinct altogether. In 1862 he gathered all of the Irish Wolfhounds he could find and attempted to resurrect the breed. In order to do so, outcrosses with Scottish Deerhounds, Great Danes, Russian Wolfhounds, and other dogs were utilized to bring back the breed’s health and vitality. The Irish Wolfhound was recognized by the American Kennel Club in 1897 and by the Kennel Club of England in 1925. 

Irish Mastiff Breed Appearance

The Irish Mastiff is a large dog, both in height and in girth. This crossbreed typically stands between two and three feet high at the shoulder and weighs over a hundred pounds. The head will be large, although not generally as massive or as wide as the English Mastiff’s head, and although you may see some of the wrinkling that you would find on the face of the Mastiff this trait is usually diminished somewhat by a longer muzzle, courtesy of the Irish Wolfhound. The eyes can be either round or almond shaped and come in medium to dark brown and the ears are small in relation to the head and set high up on the top of the head; depending on which parent breed they resemble their ears may be carried back against the head or hang down, lying close to the cheek. Both parent breeds have thick, downy undercoats protected by a layer of weatherproof fur that can be either straight, short, and coarse or rough and wiry. 

Eye Color Possibilities
brown Irish Mastiff eyes
Nose Color Possibilities
black Irish Mastiff nose
Coat Color Possibilities
black Irish Mastiff coat
blue Irish Mastiff coat
brindle Irish Mastiff coat
cream Irish Mastiff coat
gray Irish Mastiff coat
red Irish Mastiff coat
silver Irish Mastiff coat
Coat Length
Short Medium Long
Coat Density
Sparse Normal Dense
Coat Texture
Irish Mastiff wiry coat texture
Straight Wiry Wavy Curly Corded

Irish Mastiff Breed Maintenance

This hybrid has a short, simple coat that makes grooming for this canine quite manageable. Regular brushing with slicker, soft bristle brush, or curry comb is needed to control the shedding and distribute body oils, however, baths are only required every few months. If your Irish Mastiff happens to inherit the folds and wrinkles that are characteristic of English Mastiffs, these folds should be examined and wiped down to ensure that they do not have any trapped moisture or food particles as these can lead to  skin irritation and infection, possibly causing a foul odor to develop, particularly around the face. Those with the short, straight, hard fur will shed moderately year-round, where those that develop the wiry hair may have very little shedding taking place. Those with the wiry coat may also require stripping, a process which can be done by hand or by using a stripping comb.
Brushes for Irish Mastiff
Slicker Brush
Nail Clipper
Brushing Frequency
Irish Mastiff requires daily brushing
Daily Weekly Monthly

Irish Mastiff Temperament

In most cases, this will be a calm and well-behaved hybrid, although they can be a little more active and clumsy during their adolescence, which generally lasts for the first three years of the Irish Mastiffs life. Both parent breeds are very tolerant of children and naturally protective; however, these canines are extremely powerful animals and they may get overexcited on occasion, so interactions with toddlers and young children should be carefully supervised at all times. The Irish Mastiff tends to be wary but polite with strangers and socialization is required to ensure that this dog does not become overly shy, timid, or aggressive. The Irish Wolfhound, like most sighthounds, has an extremely high prey drive and in most cases, neither they nor their offspring should be trusted completely with smaller animals, particularly smaller animals that move quickly. They are eager to please and they enjoy training, which should be started as early as possible to get the maximum benefits from the training. 

Irish Mastiff Activity Requirements

Although the Mastiff is a rather laid-back breed that typically requires less exercise than other large dogs, the Irish Wolfhound is fairly active for their size and at least 40 to 60 minutes of vigorous activity a day is required in order to keep this hybrid in peak condition. Along with daily walks, these dogs are adept at diverse activities, such as drafting and carting activities, coursing ability, and tracking. During your dog’s formative years it is important to keep exercise sessions somewhat short and not overly intense in order to prevent damage to the developing bones and joints. This can be done by breaking exercise sessions up throughout the day and ensuring that your dog doesn’t rough-house or jump from significant heights. This crossbreed prefers the room that a larger house provides, but as they are not given to barking unnecessarily they may be able to adapt to apartment life if given a great deal of extra exercise in several short sessions throughout the day. Slippery surfaces should be avoided, however, in order to avoid joint and ligament damage. 

Activity Level
Low Medium High
Rec. Walk Mileage Per Week
8 miles
Minutes of Activity Per Day
60 minutes

Irish Mastiff Food Consumption

Cups Per Day
4 cups
Daily Cost
$2.75 - $3.00
Monthly Cost
$80.00 - $90.00

Irish Mastiff Owner Experiences

5 Months
2 People
Umbra is the sweetest cuddliest girl, she loves nothing more than curling up on the couch with you for a snooze. She is friendly to people and other dogs and does well with two indoor cats. We found she doesn’t chase them.
10 months, 2 weeks ago
7 Months
2 People
Walking on the beach
He is calm at times but gets very excited, I’ve noticed a change in is behaviour since finding out I’m pregnant he’s become more affectionate towards me rather then my partner, he’s just a big soft friendly giant teddy bear.
1 year, 4 months ago
3 Years
1 People
House & Yard
Explore the woods
Mosby was a pound puppy when I found him at 5 months old, his very affectionate and a great protector.
1 year, 7 months ago
Daisy May
4 Months
2 People
House & Yard
She a cuddle bug! Loves to go for car rides. She loves walks and tug a war. She just a love bug.
1 year, 8 months ago
11 Years
1 People
House & Yard
George was a foundling, he found me when he was about 8 weeks old. He is now 11 1/2 years old
2 years, 9 months ago
Book me a walkiee?
Sketch of smiling australian shepherd