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As long as it is a name brand food with an AAFCO label on it. This means it has been tested and meets specific standards. Typically royal canin, Purina, science diet, and Iams qualify for this. Be careful switching foods without suddenly as this can cause diarrhea. It is best to mix them and gradually switch it over a week
Iams is perfectly healthy dog food! The ingredients in Blue Buffalo may appear different, but both diets are balanced in their nutrients and can provide an excellent diet for any dog. It sounds like your dog likes the Iams, so I see no reason to switch to something that could upset the balance.
Both are good foods. I personally feed my dogs Iams, so if you wanted to switch to that, it's fine to do. It's important to know when switching foods to do it slowly so that Scooby doesn't get any GI upset. Start by mixing 75% old food and 25% new food, and feeding that for a couple of days. Over the course of two weeks, gradually increase the amount of new food and decrease the amount of old food until he is eating the new food only. Other brands I recommend include Royal Canin and Hill's Science diet, but those would be pricier than the Purina One and Iams. I hope this helps!
Iams is a great brand of food, and it's not as expensive as Hill's. I also like Purina ProPlan, and Purina One. All of these are healthy, and cheaper than Hill's. I recommend trying Layla on one of those foods. You will have to transition her slowly to prevent GI upset. Mix together the new and old food, and over the course of two weeks, gradually increase the amount of new food and decrease the amount of old food until she is eating the new food only. Good luck, I hope this helps!
Congratulations on your new puppy! Pepe Le Pew is absolutely adorable!! Iams puppy food is a perfectly fine food to feed him. I would recommend if you wanted to switch foods to wait two weeks before you do that. This was he gets comfortable in his environment before switching anything. You can do Iams, Science Diet, Nutro, Eukanuba and even Royal Canin. These companies do a lot of research on foods and are well balanced. Congratulations again and thank you for using Boop by Petco!