 fleas
IT may have started from fleas biting him..but now it looks like he is scratching and made a rash..Teatree oil shampoo works well, as does Chlorhexaderm...a course of amoxie will help also...lots of times you see this on the lower back...Kate has a few red spots under her front legs and she is on flea meds, so I think it was from her dress..I used the shampoo...good luck |