Are they fat??

My babies go to the vet soon. I am worried they will tell me my cats are over weight. So I want to know if you think they are fat. I could also use some advice on how to keep them at a healthy weight. They already are very active cats most of the time and I play with them often. They each get 1/4 of a cup in the morning and 1/4 of a cup at night.

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