I don't have any suggestions or help, I have one feral girl that I take care of, but I just wanted to say thank you for helping the ferals that you are helping. So sad about the pit bulls getting a hold of some of the kittens, that is awful. It is my biggest fear with my girl, Arwen, who is a feral that I've been caring for now for a year. I worry about cars and dogs, but mostly the dogs. She is pretty street smart, but my neighbors have a german shepherd that has gotten loose before.
My male cat had urinary issues, stones, uti etc, almost died, this was 4 years ago, and we switched him to wet food as he started to have these issues. The vet tried to convince us to put him on Hills, but I do not care for this brand at all, and feel the ingredients are really inferior to many other foods out there. My cats all eat Wellness canned food, no fish ones, and they have had no more issues with crystals, etc. I would encourage you to read up on the Hills food, and consider maybe adding a better food for the kitties. I didn't know any better for a long time, and fed the stuff to my oldest cat for her first year. She was not healthy, had a horrible coat, dandruff, she was fat, constantly hungry, and you should see her now on Wellness. She is like velvet, has the most gorgeous coat, teeth, and no health issues. Now I'm ducking, in case you want to throw something at me for preaching about the food......I can't help it...LOL! I hope you are not angry with me for my opinion on the food.