
Cher anytime you have unexplained concerns about a serious illness with a doggy you should call your vet. While your description does not give me enough information about what injuries might be present there is more that can be done. If the toe drag represents a damaged nerve enforced rest and corticosteroids might be indicated.
IF there is no swelling to help pinpoint the issue, here are some things to try;
1) Spray the feet with water and watch them dry, do they dry evenly? If part dries faster than the rest, that indicates heat and may indicate an abscess or other hoof issue. If so soak the hoof. You can also do this with the legs.
2) Lift up his leg, and gently palpate the tendons; does he flinch when you move or press on the tendons? This would indicate a tendon issue, which would normally be treated with rest and wraps.
3) Lift up his leg and gently pull it forward and back. Does he resist? This could indicate a shoulder problem. Bute and rest.
4) Run your palm down his back and along the sides of his neck, pressing evenly. Does he flinch? A sore back could indicate many things; it could be the primary cause of lameness, or it could be secondary