My small dog is very used to having his teeth brushed. He is 9, calm, and enjoys licking the brush. As I do with every new toothbrush, I applied his doggie toothpaste and let him lick until he was used to it. As I placed the toothbrush against his back molars he bit down, the toothbrush broke and he had swallowed the left side of bristles. He could have choked to death, and as it is, I am still on poop patrol making sure he passes the brush and it does not cause an obstruction. DO NOT BUY THIS CRAPPY BRUSH!!!! Great in concept, complete failure when used.