A little over a year ago I purchased the flea and tick drops for my 3 cats. I had used this same ... I used a flea collar on my dog and it gave him what looked like large hives and a skin reaction.

as well as flea collars like Hartz UltraGuard Flea & Tick Collar for Cats and ProElobara Flea & Tick Collar for Dogs. Consult with your veterinarian to discuss the best options for your companion.