You take the dog to a qualified animal doctor (a vet) who will diagnose the problem and prescribe a treatment.

If you want to do right by your animal, you take it to a qualified veterinarian and you follow their advice.

The dog has a bad leg. If it does not get better take it to see a qualified animal doctor (a vet).

take your dog to the vet to get him checked out

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If you dog is old it probably has cataracts but if you are worried about your dogs eyes you should take it to see a qualified animal doctor (a vet).

Please take your dog to your vet first for a complete exam, and then ask your vet what he or she thinks is best given to your dog. Your dog is too precious to take the advice of anyone other than a qualified vet.