Take a few steps and lift Teddy's right hind leg. It may be caused by trauma or calcium deficiency. It is best to check the dog's meat pad first to see if there is trauma or sharp hard objects stuck in. If so, you need to help the dog in time. Clean the dog's wound and bandage it; if not, it may be calcium deficiency, and you need to help Teddy supplement nutrition and calcium. You can feed the dog liquid calcium, calcium powder, nutritional paste, egg yolk, bone broth and other foods.