Dog Toy, tennis ball
Look guys. just think about it, if tennis balls were harmful to your dog big stores like PetSmart & Petco would not put them in there stores. They are extremely careful, putting every toy they sell, through more test than you can count. They have all kind of professional, such as Vets, that study each toy before it goes to their stores. The liability would be to great to put toys in their stores that are not safe. You can probably find on the packaging for these toys a warning not to leave your dog unattended while playing with the toy. If you don't follow the directions then you may have a problem. Not the manufacturers fault, it's yours. So follow the direction on the package.