Slicks kittens are 12 weeks old this coming week. Bubble was straining in the box and crying. I knew he was trying to go. Well, he didn't go, and when he got out he proceeded to vomit. I have seen my older cats do the same thing after they have strained to go so I wasn't too surprised. I ran out of wet kitten food the other day so they have been eating dry, which I hate to do but had to for a few days and Fancy Feast. Could this be the reason? Should I give the kitten the stuff in the tube (brown paste) I can't think of the name yet I ve used it for years on and off. (Getting old is for the birds!) They are going in on the 17th for their rabies shots and whatever else they will be needing. Any advice is much appreciated.