I have an 8 year old female, shreds practicely everything. My best buys have been a training dummy I bought from Amazon, normally used to train labs to retrieve.
Toys made from what apppears to be fire hose. I've bought several at Marshall's and Home Goods. Several companies use the product creatively making cute animal forms, etc. It takes her much longer to destroy these since they are heavy duty. As previously noted, don't give anything stuffed with fluff; I've read of several very expensive surgeries to remove it from dogs stomach and digestive tract - when the owners were lucky enough to get pet to vet.