Have you tried looking for some sisal rope made for pet toy making? It is chemical free and pretty tough. That is what a lot of cat condos' scratching posts are covered with. Try looking for untreated sisal at pet stores or on line. Sometimes you can get untreated at Home Depot as well. Just read the label very closely. You can then make General his own unique toys and keep an eye on them. Once they start fraying throw them away and make new ones.
Assumptions do nothing but make an ass out of u and me.
We can stick our heads in the sand for only so long before it starts choking us. Face it folks. The pet population is bad ALL OVER THE WORLD!