Please choose the correct ending to complete the given sentence: Pets and Animals: [header] How to care for sled dogs [title] Feed your dogs adequately. [step] Your dogs should eat a mix of high-quality dry and wet (canned) food with high levels of fat and protein. The protein and fat content in the food provides your dogs with the energy they need to run long distances.

Ending1: [substeps] You should start feeding them at the first sign of activity in your area. Start with just a small amount of puppy food or-particularly, for older dogs-wet food. Ending2: Whatever you feed your dogs, they should be taking in around 10 , 000 calories each day when they're on the trail. [substeps] Some mushers mix a cup or two of water into the food to help the dogs digest the food more easily and prevent dehydration. Ending3: Food also contains saturated fat, which can contribute to unwanted weight gain. [substeps] Similarly, rawhide blankets provide your dogs a fresh layer of weight reduction clothing. Ending4: Feeding dogs loose, healthy food isn't usually important to keep your dogs physically fit as well. It's only important to keep your dogs hydrated and they'll have another healthy, high-protein diet that's right for them.

Answer format: ending1/ending2/ending3/ending4