My dog has started chewing the collar, should I be worried?

As the vast majority of active ingredients are part of plastic  collar matrix and  are not on the surface. They are not released when the collar gets chewed. If any, mild gastrointestinal signs may be seen. Nevertheless chewing should be avoided and if your dog manages to get his own collar into his mouth it’s likely that it is applied too loosely. Ideally two fingers fit between the collar and your dog’s neck.