Oh no Sarah, I just woke up from a nap and saw your text and now your post
I hope that the vet can give something to get them better
Jada and Bogie went through this last summer. All the testing came back negative and we never did find out what caused it. Jada started first and then Bogie got it. Mine rarely go outside so we don't know what it was.
Sending prayers that Brody and Sophia are better soon.