Why, you ask? The answer is lactose intolerance — yes, cats can have it too. Purina says that the high amount of lactose found in cow’s milk is usually too much for a cat’s digestive system ...

"He wasn't doing too good," said Journell, noting that Alexander drank much more of the milk than the other cats. "He'd jump on the bed and just put his head down. I thought, what's wrong?" ...