With your dog standing square, lift up one hindleg & hold flexed under the body, encouraging your dog not to put any weight through the limb & your hand during the exercise. It is sometimes helpful to bend the toes under to discourage weight-bearing.
To begin with, try to have them stand in this position for 5-10 seconds & gradually increase to 30 seconds as their confidence improves.
Professional physiotherapy and hydrotherapy centre for dogs in South East Kent