Schatzie's an agressive chewer also. It has always been a hit and miss w/ what toys work the longest. She is extreamly rough and also chews her way to the squeeker.
I either sew them back up and see if the toys can get a bit longer life or head right back into the direction of the toy store to "re-stock" her supply.
BTW, Schatzie has the AKC squirrel and it's still in PERFECT condition. This toy is strong as glue! I am so highly impressed!