I’ve never heard of Nutrena. I see from their website that they have two formulas, Naturewise Premium Rabbit Pellets and Naturewise Performance Rabbit Formula. Both of these seem geared to show rabbits and breeding of rabbits. They mention that the pellets provide miaximum coat quality, support milk production, and support high conception rates leading to big litters of strong rabbits, etc. They also say that no hay is necessary, but later states that you can feed hay such as alfalfa, clover, sweet clover, lespedeza, soybean and peanut hay. I’ve never heard of most of those hays, and alfalfa is only for very young rabbits. Another thing they say is to keep the rabbit hutches clean. They are clearly catering to the breeders and not to house rabbits. This doesn’t sound like a company that knows anything about rabbits as companion animals, and I wouldn’t think that their pellets would be suitable, for adult rabbits especially–unless your pet supply store has a completely different formula. But I only saw the two varieties on that website.