Dharma Dog® pure wool toys are fun your dog can sink their teeth into. The wool blend allows your dog’s teeth to sink in all the way to the gums. Coarse wool fibers have jagged edges to scrape away food and plaque. Dharma Dog uses safe, non-toxic dyes and there are no synthetic fibers that may be harmful if ingested. Odor-Resistant Wool releases moisture into the air before bacteria can develop and start to smell. It is mold and mildew resistant.