It’s going to depend on the individual dog, there are some dogs who love to work and get excited. In my opinion, they get happy about it because that backpack is a predictor that they get to go on an adventure. The most important thing to keep in mind when hiking with your pup is that the outing is enjoyable for both of you. So make sure your dog actually likes wearing a backpack before you hit the trail. What you would do first is try to make the appearance of the backpack mean that good things are going to happen, show them the backpack, give them a treat. Playing games and providing food while your dog wears a backpack helps him see the gear in a positive light. Take it slow, and don't rush the process, so, buy the backpack and get it fitted well before the outing you hope to use it on. If a dog’s backpack is too heavy, they are more susceptible to foot injuries, she said. Overall, yes, it's OK if the dog has learned how to use it and if it's not overloaded and it fits them comfortably.