Q: Why don't pet food companies use rodent meat for cats, and for dogs too, when in nature rodents would be a large part of their diet?
A: There are two answers. One is that most people would object to rodents as a food ingredient. Two, there is no source available in the quantity needed - thousands of tons.
As an alternative, consider Wysong Au Jus™ canned rabbit, turkey, chicken, duck, venison and beef.
Also, Wysong TNT™ raw cat and dog foods, and Wysong cat and dog supplements.