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How to treat a sprained ankle on a dog
Understand your dog's anatomy.
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.
This is similar to where a your ankle is when you stand on your toes. Dogs do not have ankles on their front legs, just as you don't have them on your arms.