I have a 60lb shepherd lab (aka "shlab") named Leela. After a long day of defending the house from the postmen and utility workers, she likes to unwind with one of her favorite toy, the JW Invincible Double Chains. The two interlocked double rings made of tough rubber make for great fun chewing, gnawing and thrashing them wildly about.
As a dog that I could describe as a "CHOMP,CHOMP, gone" kind of chewer, these rings have stood up wonderfully to whatever adventures she decides to take them on. They clean nicely as well, and are very easy to bring along with you to the cottage, on walks or wherever you decide to go! These toys also come in 1 ring and 3 ring varieties as well, to please whatever kind of chewer you have.
Ren's Pets Depot - London