Human Food and Pets
Milk
This is probably surprising to many, but adult cats are lactose intolerant. They can't break down milk sugar, and thus dairy products can cause dehydration and diarrhea in your felines.
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Grapes and Raisins
It can take just four to five grapes or raisins for your dog to get extremely sick. Small amounts can lead to irreversible kidney damage in most dogs. Take your canine to the vet immediately if it eats grapes, especially raisins, as the latter are more easy to gobble up quickly in large amounts.
Bones and Fat
Bones and fat usually cause upset stomach, diarrhea and vomiting in cats. Bones are also dangerous for cats because they can lead to choking, or create obstructions and lacerations in your feline's digestive tract.
Macadamia Nuts
Not usually fatal, macadamia nuts can still cause severe illness in your dog. A mere handful of these nuts can lead to vomiting, muscle and joint pain, swelling and lethargy.
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Onion
Any form of onions (raw, cooked, powdered, etc.) is unsafe for your cat. A small amount of this root vegetable can easily cause onion poisoning. Onion poisoning breaks down a cat's red blood cells, causing anemia, weight loss, lethargy and more.
Garlic
Similar to onions, a small amount of garlic can quickly cause internal problems in your cat. Feline stomachs are easily upset by garlic, and the ingredient can also cause red blood cell damage.
