We have a cat that is allergic to fleas too.... he would bite all the fur off his belly and the fur would drop out along his backbone, showing little scabs and sore patches. To add insult to injury, he's allergic to most flea preventatives too. They made his hair fall out even more and he would throw up all over the house.

We finally found that a regular combing and a pill called '4fleas' that can be taken daily and caused no side effects helped. His fur has grown back and he's back to being revolting in other ways.

Check that your puddy has no fleas - I found a standard nit comb available from pharmacies was best as "flea combs" had teeth too widely spaced to get the little buggers and their dirt.

LTS