I received my lovely Scooby AKA Jarhead from this shelter. He was on different food while in their care. However; he's on Science Diet and has been for years and never have I had a problem with him throwing up or having runny poop. Let's keep in mind the shelter is running on bare minimum and thank goodness that these animals have somewhere to stay and food and watered. Then a little time later we got our Baby Girl AKA I can't remember lol what they named her at that time. She as well as Scooby eats Science Diet. She's a Chihuahua long hair and Scooby is a big mixture of??? So they're on two different foods however the same with her she doesn't throw up and she doesn't leave runny poo everywhere. I know these are dogs however maybe give your pet kitten / cat a little longer to adjust because both of the animals that I got from the shelter did have the runs at first. That's not to say that the shelter was doing anything wrong. It's a big adjustment for these animals.
I adopted a dog and it turned out he had roundworms.
Does it throw up a lot? It also could be the food you are feeding the cat is different from the shelter.
Thanks! Your answer is awaiting moderation.