A dog’s size will determine how much they can carry in a backpack. A general rule of thumb is no more than 10 to 12 percent of your dog’s bodyweight. You should also consider your dog’s breed, strength, and general health. Larger, stronger breeds, such as Labrador retrievers, can potentially carry more weight, but consult with your veterinarian first. She also recommends speaking with your vet if your dog has a long back, like a corgi or dachshund, is under one year old, or has arthritis, orthopedic problems, or heart conditions. Test the empty pack around your house first to let your dog get comfortable and used to it, then gradually add small amounts of weight. Properly Packing Your Dog’s Pack Just as you’d consider balance when loading your own overnight pack, consider weight distribution on your dog’s back. Saddlebags should have even weight on each side. Keep an eye out for other signs of pain and fatigue like an abnormal gait or limping, frequent stopping, vocalizing, and biting at the pack, which can be signs that the pack is too heavy or something else is wrong. In the case of any signs of distress, reduce the weight on your dog’s back, adjust the pack fit, or remove the pack entirely.