But avoid dryer lint! Synthetic fibers become crumbly when it gets wet, then it dries hard. Certain laundry detergents and fabric softeners can also leave harmful residues.
Offer the following instead:
- dried leaves, twigs, and grass
- pet fur that is NOT treated with flea and tick treatments
- yarn, string or cloth cut into 4-8-inch strips
- cotton batting
- sheep's wool