Please choose the correct ending to complete the given sentence: Food and Entertaining: [header] How to treat a sprained ankle on a dog [title] Understand your dog's anatomy. [step] Dogs actually stand and walk on the toes of their front and rear legs. When a dog is standing, you will see its ankle on its hind leg between the knee and the toes.

Ending1: This is similar to where a your ankle is when you stand on your toes. [substeps] Dogs do not have ankles on their front legs, just as you don't have them on your arms. Ending2: [title] Learn what leg your dog is walking on. [step] Notice how much the dog's body shifts as it walks. Ending3: The toe is the part of the inside of the leg that sticks out in front. When a dog sits, the affected foot will have a length of protrusion out the leg. Ending4: [title] Understand that dogs may have a leg swelling. [step] The swelling is usually associated with a dog's tendons collapsing under the toenail.

Answer format: ending1/ending2/ending3/ending4