Short answer
Yes, dog treats containing cooked, peeled chestnuts are generally safe to buy and feed. Chestnuts are one of the lower-fat nuts, making them a better choice than treats with walnuts or macadamias, which are toxic. Always check the full ingredient list to ensure the treat isn't also high in sugar, salt, or artificial additives. As with any new treat, introduce it slowly and watch for any signs of stomach upset, calling your own vet if anything seems off.
Chestnuts — Food safety facts
Safe to share · Dogs · full breakdown on the linked food page
Cooked, peeled chestnuts are safe in small amounts. They are lower in fat than other nuts.
The full verdict, portion guidance and serving notes are collected on the Chestnuts food facts page.