Not absolutely industructable
My English Bull Terrier is 4 years old and he has had 8 Black XXL Kongs. He takes them everywhere with him and he chews them till there is nothing left - only litle bits of black rubber all over the house. We buy them in 3's now since his first couple, so that he always has one around him. Isn't there something that is industructable - its costing us a bomb!