The Costco dog food is made by Diamond Pet Foods INC.
All of Costco and Kirkland brand dog food and pet foods are made in Diamond Pet Foods INC manufacturing facilities in the United States.
Diamond Pet Foods currently owns 4 pet food manufacturing plants in the U.S. where most of their products are made.
The Costco Brand dog food as well as the Kirkland dog food brands are good healthy dog foods for your dog.
They are a budget dog food that most dogs like.
All their other pet food products are also great for most pets.
Although all pets like different foods and one pet may not like a certain brand of dog food or pet food and so you just have to try different brands.
My dog loves the Costco dog food.