LoginIs Nulo Challenger a good grain inclusive dog food? Search for: Dog Food Advisor › Forums › Canine Nutrition › Is Nulo Challenger a good grain inclusive dog food? Viewing 1 post (of 1 total) Author Posts April 29, 2020 at 12:11 pm #156456 Report Abuse Marnie CParticipant I used to feed my dogs Orijen Regional Red but since the latest concerns about grain free dog food, I switched to Nulo. The people at Pet Food Express highly recommend it. I have active whippets. Author Posts Viewing 1 post (of 1 total) You must be logged in to reply to this topic. Log In Username: Password: Keep me signed in Log In