Does Seresto Flea Collar Makes Dogs Sick?

Does Seresto Flea Collar Makes Dogs Sick? The vast majority involved pets that ingested collars, typically dogs that ate their collars or chewed a housemate’s collar. About 60% developed clinical signs, and about 90% of those with clinical signs vomited, she said. Some also developed diarrhea or mild lethargy. Are there side effects to Seresto