Check out the Tuffy tug-o-war. I give the various Tuffy toys high marks because the higher the number on the toy the tougher it is. They even have a ring toy (mega ring) that is rated 10 out of 10 that they tested with tigers. I have the ultimate bone, ring, and tug-o-war. These have lasted very well with mine and they love to destuff and destroy soft toys. Nothing is indestructible, but these toys are darn close. They have a web site, but I find a lot of these toys at local pet stores. http://vipproducts.com/retail/files/index.php?cPath=27
I find with these toys Samantha finds the seam that is not even on the edging of them. She gets her teeth on the and the toy is history. If they would only just sew a straight seam............