Accepted Answer

Thanks for the question Jess.

While I cannot diagnose this over the internet one of the main conditions this could be is an allergic dermatitis. Sometimes dogs develop a sensitivity to a small protein in the saliva of the flea and this causes skin lesions in the area you mention. It does not matter where the dog is bitten by the flea, the rash will still appear in the same place at the back and the base of the tail. Where a dog is sensitive only a very small number of fleas would be required for full blown symptoms to develop.

Here is a link to an image of a dog with flea bite dermatitis : LINK

This condition is very easily treated by your vet who will if appropriate use anti-allergy drugs plus antibiotics. If it turns that out it is flea bite dermatitis then you need to be meticulous with your flea control not only on the dog but in the house as well.

If I can advise you further please get back in touch.

Scott Nimmo BVMS

Expert:	Scott Nimmo BVMS, MRCVS.
Pos. Feedback:	99.9 %
Accepts:	2580
Answered:	8/26/2008

Dog Veterinarian

I have 28 years experience in all aspects of canine medicine and surgery.