The Answer is... Cucumbers!

Cats don’t have the enzyme to digest milk once they are weaned off their mother’s milk. 

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Onions, shallots, leeks, garlic, and chives are part of a group of plants called alliums which are toxic for cats and dogs. They cause gut upsets, and damage red blood cells, which results in anemia. Symptoms include vomiting, diarrhea, a reduced appetite, and dehydration.

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Caffeine and theobromine in chocolate can be toxic to cats if consumed in large enough volumes.