Can Cats Eat Yogurt?
Yes, plain, unsweetened yogurt is safe for most cats in small amounts, though many cats have some degree of lactose intolerance. A teaspoon of plain whole-milk yogurt has about 3-4 calories and contains live cultures like Lactobacillus acidophilus that may support digestion, along with roughly 20 mg of calcium. Greek yogurt is lower in lactose due to straining and may be easier on sensitive stomachs. Start with a half-teaspoon and watch for loose stools over the next 24 hours. Never give flavored or sugar-free yogurt — added sugar contributes to obesity, and xylitol in sugar-free varieties is dangerous. Yogurt should stay an occasional treat, not a diet staple, since cats are obligate carnivores.
Key Takeaways
- Most adult cats produce far less lactase than kittens, the enzyme needed to break down lactose in dairy.
- Cats with dairy allergies, which differ from lactose intolerance, can react to milk proteins even in small amounts — watch for itching or vomiting.
- Kefir is thinner than yogurt and contains more probiotic strains; it's an option in the same small amounts if your cat tolerates dairy.
Explanation
Most adult cats produce far less lactase than kittens, the enzyme needed to break down lactose in dairy. This is why cheese affects many cats similarly — plain yogurt carries the same risk of gas, bloating, or diarrhea if a cat's gut can't process the milk sugar. The fermentation process in yogurt does break down some lactose naturally, which is why many cats tolerate a small spoonful better than they'd tolerate the same amount of milk.
The live active cultures in plain yogurt — typically Lactobacillus acidophilus and Bifidobacterium — are marketed as gut-supporting probiotics, and some veterinarians suggest a small spoonful for cats recovering from antibiotic treatment or mild diarrhea. Look for labels stating 'live and active cultures.' Greek yogurt is strained further than regular yogurt, which reduces its lactose content while roughly doubling its protein, making it often the better choice for cats with sensitive stomachs.
Portion size matters more for cats than for dogs given their smaller body size. A 10-pound indoor cat needs roughly 200 calories a day, and a full tablespoon of plain whole-milk yogurt runs about 9 calories — a modest but real share of that budget if offered daily. Keep treats, including yogurt, under 10% of daily calories. A half-teaspoon stirred into food once or twice a week is a reasonable starting point for most healthy adult cats.
Flavored yogurts pack 10-20 grams of added sugar per serving, which cats don't need and which contributes to weight gain. Sugar-free versions are riskier still: some use xylitol, a sweetener well documented as toxic to dogs and suspected of causing similar insulin spikes in cats, though feline-specific data remains limited. Kittens under eight weeks shouldn't have yogurt at all — stick to cooked chicken or scrambled eggs for treats once they're weaned.
Things to Know
- Cats with dairy allergies, which differ from lactose intolerance, can react to milk proteins even in small amounts — watch for itching or vomiting.
- Kefir is thinner than yogurt and contains more probiotic strains; it's an option in the same small amounts if your cat tolerates dairy.
- Cats with kidney disease should skip yogurt, since its sodium and phosphorus add strain to compromised kidneys — the same caution applies to cheese.
- Frozen yogurt sold for humans usually contains sugar, chocolate, or xylitol and should never be given to cats.
- If your cat refuses yogurt outright, tuna can deliver a similarly high-value treat without the dairy question.