When Jax was around three months old, we bought him a kong toy, tennis balls, puppy nylabones and a heavy duty rubber squeaker. These lasted long enough that we didn't mind buying him new ones when he finally chewed them up. Now he's six months old and getting those strong back teeth in. A large kong toy lasts one day. He pops tennis balls in an hour or so. Heavy duty rubber squeakers last about a day. 12 to 14 inch beef bones he works on for a few hours and I finally have to take the remainder of them away from him when they get small enough to choke him. He had all those things at the beginning of last week and now they're gone; the remaining pieces thrown away. The only toy he has left right now is a souper sized hard nylabone. What's a hard toy that will last? DH is threatening to get him a tractor tire. The up side is that he doesn't chew on household items, just his toys.