Recommended toys, chews and treats are listed in out Great Bulldog Products forum. I can't link it because I am on my iPod. Large Nylabones, Kongs, deer and elk antlers are good ones. You don't want to give anything that becomes moist like rawhides, bully sticks or pig ears.
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Here's the link to the Great Bulldog Products forum
he'll probably love the Kong toy when you stuff it with some good stuff (peanut butter, his favorite treats, veggies, etc). If you freeze it, he'll be busy for hours.