To switch your Aussie's diet, we generally recommend transitioning over the course of one week, gradually phasing out the old food and introducing the new food. For the first two days, feed 25% new food and 75% old food. After that, move to 50% and 50% for two days, then 75% new food and 25% old food for two more days. By this point, your dog should be ready to eat only their new food! If your pup tends to have a more sensitive digestive system, it's perfectly okay to make the transition even more gradual. Always monitor for any vomiting, diarrhea, or appetite changes that would indicate your dog is having trouble with the new food.