Max GSD kills everything when it comes to toys, solid chew bones he knows through them (even though the label says they won't) Kong ball with a large rope-dead flopping piece of plastic now. Here is one item that has lasted him is the white boat fenders. He chewed the end eyelets off but the main body just collapsed and he plays with everyday now for a couple of years. Has a larger one but prefers med size toys, as the whistle balls as he puts 2 at a time in the mouth-so we need 3 when flinging them out in the field. Tennis balls are not a great choice as the fibre wears the enamel off the teeth. Raw bones are the best if cut properly not elk/deer antler sheds they sell in the pet stores. Our vet sees one on the rack or somebody buying one and she says to herself: There's another $600-800 in my pocket for the broken tooth extraction"
Rawhide: 3-5 days to pass through the dog-just read up on that one, and how it's not great for the dog.