Whimzees are honestly excellent chews for just about all small pets
They're extremely high quality and are wonderful for dogs as intended(while vegan and vegetarian diets are bad,plant based treats and chews in moderation are usually fine with caution to certain ingredients)and many other pets.
Ingredients(taken from alligator version,but universal throughout):
Potato Starch, Glycerin, Powdered Cellulose, Lecithin, Yeast, Color Added (Malt Extract, Annatto Extract, Alfalfa Extract).
So,they'd be safe for just about any pet except with rats I'd just not feed the green version(alfalfa,not highly digestible to rats but in this amount fed rarely it shouldn't hurt)too often.For mice though it should be fine regardless of color