While dog-sitting my daughter's 18-month-old half Lab, Hanover, who is half Golden Retriever and a Guide Dogs for the Blind "Second Career" dog, I have found that he can have very few toys because he is such a mighty chewer. He will have the squeaker out of a stuffed toy in less than 60 seconds. Even the largest size Ultimate Kong got big gouges chewed out of it rather quickly. About all he can have is the largest size Nylabone for a half hour after meals and his Ultimate Kong rubber ball. I'm getting him an Ultimate Kong flexible frisbee, too, but he can play with that only under supervision (i.e., fetch in the back yard).
He actually was dropped from Guide Dog training only because of health reasons (frequent vomiting). Since my daughter is a veterinarian, she's been able to control the vomiting by finding a food he's not allergic to.
May your trails be crooked, winding, lonesome, dangerous, leading to the most amazing view--E. Abbey