Several years ago, when my boston was pregnant with her 4 perfect babies, the day before she delivered, she broke out in hives that progressed until the next morning she was all disfigured and lumpy, horribly traumatizing! I was staying at the breeder's house for the pregnancy because they were taking care of the delivery, and I asked him about the hives, and he told me she was allergic to her own maternal horomones, and that her mother had been the same for her pregnancy. After the babies were delivered, the hives vanished, never to return, until now.
Recently, I purchased a few guinea pigs, and Rista, poor darling, thinks that the little squeaks and the smells and she cleans their faces and bums, she thinks they're her babies, or babies in general. It's sad, because Rista was never crazy about being a mum, but instinct is stronger. And even though she was spayed last year, she's exploded in hives, it's so horrible!! It doesn't bother her any, but she does get a bit itchy and hot. I bought her bubble gum flavoured antihistamine and have been giving her child doses, her tummy lumps and blotches cleared up, but her back and face are getting more lumpy, I'm afraid I'll wake up tmo and she'll be all "Igor" again, it's so upsetting to see, even though she's really ok.
Right now she's stressed out and pacing and panting, poor baby, I'm hoping it will pass soon.