Top 8 Largest Domestic Cat Breeds With Sizes & Care Tips

Domestic cats descended from African wildcats have evolved into many distinctive breeds over millennia, each with unique traits including size and build. If you're curious about which cats are the largest, we've compiled the top eight biggest domestic cat breeds commonly kept as pets, along with important care information to help you make an informed and responsible choice.

1. Savannah Cat

Savannah cats claim the top spot as the largest domestic cat breed. They are a cross between domestic cats (often Siamese) and wild servals from Africa, making them a unique hybrid breed. Their size varies widely depending on how close to wild ancestry they are, with the biggest males weighing up to 30 pounds—comparable to a small dog. These cats are highly active and retain a strong hunting instinct, which raises concerns about wildlife impact and suitability in typical UK homes. Potential owners should carefully consider their needs and legal regulations before acquiring a Savannah cat.

2. Maine Coon

The Maine Coon is one of the largest traditional domestic breeds without recent wild ancestry. Males typically weigh 15-25 pounds, females 10-15 pounds, and this sturdy breed often grows very tall and long-bodied. Known for their friendly personality and adaptability, Maine Coons make excellent family companions. They're also cherished for their playful yet gentle nature and dense water-resistant coat suited for colder climates.

3. Chausie

The Chausie is a rare, exotic breed in the UK, descended from hybridisation between domestic cats and the wild jungle cat. They have an athletic build with males weighing up to 22 pounds and females 8-15 pounds. Chausies are intelligent, highly energetic, and social animals that benefit from plenty of activity and engagement. Their rarity means they are often imported or bred locally with high demand and prices.

4. Ragdoll

Ragdolls are large, long-haired cats with a docile temperament and affectionate disposition. Females weigh between 10-15 pounds, and males typically reach 15-20 pounds. They're known for their relaxed behaviours, often going limp when held, making them fantastic companions for quieter households. Ragdolls require regular grooming due to their soft coats.

5. Ragamuffin

Close relatives of Ragdolls, Ragamuffins are muscular and robust cats taking around 4-5 years to reach full maturity. Females generally weigh 10-15 pounds, males up to 20 pounds. They possess gentle, friendly temperaments and share the Ragamuffin’s plush, thick coat which demands consistent care to prevent matting.

6. Norwegian Forest Cat

The Norwegian Forest Cat hails from Scandinavia, bred to withstand severe winters with a thick, water-resistant coat. Females weigh up to 15 pounds and males usually 15-20 pounds. Their long, fluffy appearance resembles the Maine Coon, and they have a calm yet playful personality. This breed appreciates outdoor adventures and stimulation but adapts well to indoor living.

7. Siberian Cat

Originating from Russia, the Siberian is a sturdy, medium-to-large cat valued for hypoallergenic properties as it produces less Fel D1 protein, the common allergen. Females generally weigh 8-12 pounds, males 15-17 pounds or more. Siberians are affectionate and intelligent, sporting a thick, triple-layer coat suited to cold climates but requiring regular grooming.

8. American Bobtail

The American Bobtail is among the larger Bobtail breeds with females weighing 7-11 pounds and males 12-16 pounds. Their distinctive short or bobbed tail results from a natural genetic mutation, giving them a wild, expressive look. These cats are playful, adaptable, and form strong bonds with their owners.

Cat Size, Health and Weight: Responsible Ownership

While mixed-breed domestic cats can sometimes grow large, it’s important for owners to monitor their cat’s weight, ensuring it reflects healthy muscle mass and stature rather than excess fat. Large breeds may be prone to certain health issues such as joint problems or heart conditions, so regular veterinary check-ups, balanced nutrition and appropriate exercise are essential. Always source your cat from reputable breeders or consider adopting from shelters to promote ethical and responsible pet ownership.