Hi M X-
I have some personal experience with Purina Pro Plan Sport, I fed the 26/16 formula for over 2 years. I only recently switched because I needed a cheaper food.
My dogs had the complete opposite response to the food than what your dog is having. They were a great weight, shiny beautiful coats, small perfect stool, energy for days and they loved eating. One dog is 4 the other is 11.
I have no concerns about any ingredients in Pro Plan, but it doesn’t sound like your dog is doing well on this particular formula. As far as weight gain goes, this is a high calorie food, meant typically for working dogs or dogs with high metabolisms. If your dog doesn’t get a lot of exercise (which you can change) this may not be the right formula for him. Or you may have been overfeeding him. Dogs need to eat less of a calorically dense food to meet their daily nurient requirements.
Pentobarbitol was not found in Purina foods just as an aside. That was Evangers, which is not made by Purina. Purina hasn’t had a recall since 2016, which was not involving Pento.
