Vet Q & AWhy are my dogs itching and raw even with flea and tick treatment?
This would be the most common area for flea allergies to manifest themselves. With flea allergies, all it takes is one bite from a flea to send the whole body into an itch cycle. Sentry Plus is a generic form of Frontline, which doesn't seem to work as well as some of the newer, prescription flea preventatives. I would recommend that you have the dogs evaluated by the vet to determine if it is flea allergies, or something else like food allergies, mites, or a bacterial infection. The vet may recommend a different flea preventative, anti-inflammatories, anti-itch medications, antibiotics, or medicated shampoos based on the health of the skin.
https://www.petcoach.co/article/flea-allergy-dermatitis-or-flea-bite-hypersensitivity/
Updated on September 24th, 2025