Review on 🐶 Hartz UltraGuard ProMax Flea & Tick Collar for Dogs and Puppies - Tin of 2 Collars | 6 Months Flea & Tick Prevention and Protection by Yalena Torres

I bought these for my two Yorkshire Terriers who weigh about 8 pounds each. I put them on and on the second day I noticed that they scratched my neck a lot. I took the collars off and one of the dogs seemed better but the other kept scratching and suddenly ran around rubbing his neck on the ground so I checked and he had a little red spot under his neck that was getting bigger and bigger became more inflamed. became a weeping sore area. Apparently, she was in great pain, needed medication and special baths, and felt unwell for several days. I would NOT recommend this collar for small dogs as I feel it is too strong with harmful chemicals.