Can Cats Eat Hamburgers?
By Pettings · Sources checked Nov 2, 2026
No. Keep hamburgers away from cats. The beef in a burger is not the problem on its own, but a hamburger as people eat it comes with salt, seasoning, onion, a bun and sauces, and several of those cause trouble for a cat. The ASPCA warns that onions, garlic and salty foods can make pets sick.
Why Hamburgers Are a Problem for Cats
Onion is the ingredient to worry about most. Burgers often come topped with onion, and many patties are mixed with onion powder, garlic powder or a seasoning salt. The Merck Veterinary Manual says cats are the species most susceptible to onion and garlic, and that cats have reacted to less than a teaspoon of cooked onion. The ASPCA says these vegetables can damage red blood cells and lead to anemia.
Salt and fat come next. Restaurant patties are salted heavily, and ground beef for burgers is often fatty. The ASPCA notes that the oils and fats in nuts can cause vomiting, diarrhea and potentially pancreatitis in some pets, and the Cornell Feline Health Center lists excessive dietary fat among the factors associated with pancreatitis in cats.
A cheeseburger adds cheese, and WSAVA notes that many cats are lactose intolerant; cheddar also runs about 120 calories per ounce. Ketchup and many burger sauces contain onion powder, and pickles and bacon add more salt. An undercooked burger brings one more concern, since the ASPCA says raw meat can carry Salmonella and E. coli.
If you want to share beef, cook a small amount of lean ground beef plain, with no salt or seasoning, all the way through, and drain the fat. WSAVA lists lean cooked beef at about 64 calories per ounce, so a cat's portion is small.
Signs to Watch For
Onion damage is slow. Merck says signs usually appear a few days after the meal and include tiredness, poor appetite, weakness, fast breathing, yellow gums and dark urine. Salt can bring thirst, vomiting, diarrhea and, in larger amounts, tremors or seizures, according to the ASPCA. Cornell lists lethargy, loss of appetite and dehydration among signs of pancreatitis.
What to Do If Your Cat Ate a Hamburger
If your cat ate a bite of patty with onion, onion seasoning or a sauce, call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 right away. Do not try to make your cat vomit unless a vet tells you to. Bring the wrapper, the recipe or the seasoning jar so the vet knows what was in it.
If your cat has a food allergy, pancreatitis or any other medical condition, ask your veterinarian before offering beef or any other people food.
Common Questions
Can cats eat plain hamburger meat?
Yes, if it is plain. A little lean ground beef cooked all the way through, with no salt, onion or garlic, and with the fat drained, can be a treat for an adult cat with no medical issues. WSAVA lists lean cooked beef at about 64 calories per ounce, so about 1 tablespoon of crumbles is plenty, and it replaces part of the day's food.
Can cats eat cheeseburgers?
No. A cheeseburger combines a salted, often seasoned patty with cheese, a bun and sauces that may contain onion powder. WSAVA notes that many cats are lactose intolerant, and it lists cheddar at about 120 calories per ounce, which is a lot for a small animal. If your cat took a bite, watch for vomiting or diarrhea and call your vet if onion was involved.
Can cats eat hamburger buns?
No. A bun is soft white bread, often with sugar and sesame seeds, and some are brushed with butter or garlic. A cat is an obligate carnivore, and the Cornell Feline Health Center says it relies on nutrients found only in animal products. A nibble of plain bun is unlikely to cause trouble, but it gives your cat nothing it needs.
My cat ate a burger with onions, what should I do?
Call your veterinarian or the ASPCA Animal Poison Control Center at (888) 426-4435 right away, even if your cat seems fine. The Merck Veterinary Manual says cats have reacted to less than a teaspoon of cooked onion, and that the red blood cell damage usually shows a few days later. Do not make your cat vomit unless a vet tells you to.
Can cats eat raw hamburger?
No. Raw ground beef can carry bacteria, and the ASPCA says raw meat may contain Salmonella and E. coli that can make both pets and people sick. Grinding spreads any surface bacteria through the whole batch. If you share beef, cook it plain until no pink remains and drain the fat before giving your cat a small amount.