Anti Chew and Nibble Liquid. It is the bitterest active agent known to man that makes Perrystop anti chew and nibble liquid so effective. Perrystop protects furniture, dog baskets, door frames, dog kennels and any objects, where dogs might chew or nibble. So it is very helpful to prevent puppies from biting and chewing, particularly also in dog breeding.Perrystop is not fragranced, clear and absolutely non-toxic. It does not stain and even if used constantly, it is completely harmless to animal, man and environment. Advice:Some drops of Perrystop prevent your dog from licking a medically treated wound. Frequently you may leave those uncomfortable funnels around the dog's neck. Available size: 450 ml.