the Black Kongs are Fantastic! I have to large dogs ( Rottie and a Lab/dane mix) who can destroy alomost everytoy i give them in a matter of minutes.. even the ones that are suppossedly for agressive chewers...or deemed indestructable. Beside Nylabones,, Black KOng in the only thing that holds up to this claim. I have had my original Kong through many years of my first Rottie and it still barely has a mark in it, now i had to get a second one since i have 2 dogs and they both love it. As an extra treat sometimes i fill it w/peanut butter or dog bones, but they love it even when… read full review »