He had a Kong before, killed it. Dead. Rawhides, gone within 30 mins. I don't buy rawhide anymore because at the rate he eats them I don't think it is healthy for him. Seriously. I buy them the marrow (real cow leg bone) bones from the butcher and they can't eat them but they don't float well.
I have seen retriever trainers that float @ Bass Pro shop but they weren't cheap. He never chews anything that he isn't supposed to (well besides the pool hose, but it was floating in the pool and he brought me the piece he broke off.

) and he is such a good retriever and loves to play (he is only a puppy still @ 18 months) and swimming is great exercise for both the dogs, there has to be something out there!