When I fed tonight more spots have developed on her other side. After researching more I'm thinking maybe hives?? When I rub her belly it feels lumpy, some larger than others. She'd been given penicillin for a respiratory infection a few days ago, she's had it before with no reaction but I've read where they may have a reaction if it goes directly in the bloodstream. I plan to call the vet in the morning to see if there is something to give her relief from the itching.