My dog Max (shihtzu cross poodle) had the exact same thing this time last year!!!! I took himt o the vet and they said the same thing but I KNEW it couldnt be fleas as neither of my dogs had or have ever had them and they are regularly treated (Monthly with an all in one wormer/flea control tab. If we go out to a park where there are otehr dogs around or we are in long grass I will give them a capstar tab JIC.

I told the vet this and he said maybe a fleajumped on, bit him andjumped off and the dog had an allergic reaction. I almost laughed but didnt.

I dont know what it ended up being but I shaved all the area around it so the hair wouldnt irritate it and wouldnt create a moist environment for the scab not to heal but whatever it was, he hasnt had it again.

Hope your furbaby is feeling better soon.