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Quick answer: Use caution
Plum flesh is safe but pits are toxic. Plum flesh is safe but pits are toxic to cats.
A plum is a fruit of some species in Prunus subg. Prunus. Read more on Wikipedia →
Pits contain cyanide and can cause intestinal obstruction. Remove pit completely. Dried plums (prunes) can cause digestive issues.
The risk with plum is usually dose-dependent — a small accidental amount is rarely an emergency, but regular feeding or large portions can cause problems. Always introduce in tiny quantities first, watch for digestive upset, and skip it entirely if your dog has any pre-existing condition (pancreatitis, diabetes, allergies, or kidney issues).
Plum, black, with skin, raw — 58.7 kcal, 0.58 g protein, 0.28 g fat, 13.5 g carbohydrates, 1.35 g fiber, 7.96 g sugar. Source: USDA FoodData Central.
The flesh is non-toxic. Pits, stems, and leaves contain cyanide. Always remove the pit. Most cats aren't interested in plums.
Because cats process many compounds differently from dogs, the safety threshold for plum can be much lower. Even a 'small taste' that a dog would handle may bother a cat. If you have any doubt, simply don't offer it.
If you're freezing portions of plum as a hot-weather treat, freeze in single-serving sizes so you're not thawing more than your pet will eat in one session.
Even with safe foods, individual sensitivities are real. Stop feeding and call your vet if you see any of:
If your pet's symptoms are severe, contact an emergency veterinarian immediately. In the United States the ASPCA Animal Poison Control Center is reachable 24/7 at +1 (888) 426-4435.
Cautiously. Plum can be tolerated by some dogs in small amounts, but it isn't a recommended treat. Speak with your vet before making it a regular part of your dog's diet.
Some component or preparation method makes plum more likely to cause digestive upset, allergic reaction, or longer-term issues than a fully safe food. Read the 'Dogs' section above for the specific concern.
A tiny taste once is rarely a problem. Repeated or large portions are where issues develop. As a rule, don't make plum a recurring treat without your vet's approval.
Cats often have a narrower safety margin than dogs for borderline foods. If in doubt, simply don't offer it to your cat.
Watch for vomiting, diarrhea, lethargy, or unusual behaviour over the next 24 hours. If anything seems off, call your vet.
Yes — most caution foods have a clearly safe equivalent (for example, plain cooked chicken instead of seasoned table scraps). Ask your vet for treat ideas tailored to your pet's diet.