On Tuesday morning, Per the report, which Get push notifications with news, features and more. + Follow Following You'll get the latest updates on this topic in your browser notifications. The Seresto collars excrete pesticides to help keep cats and dogs pest-free for up to eight months without harming them. However, according to the report, some pet owners have pointed to the collars as the cause of their dogs' lethargy, loss of motor functions, skin problems, and seizures. "My takeaway is that it should be looked into," says Elizabeth Trepp, DVM. "I want to recommend the best products for my patients, and therefore as a vet, I rely on agencies like the [Food and Drug Administration] and EPA to do their due diligence."