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Hello, this is Dr Linda, a UK based vet.
I'm sorry to hear he has not been himself and understand your concern.
Lifting of a hind leg is not a sign I have seen a dog with anal gland issues do before.
This would make me wonder if something else may be going on; perhaps a muscle strain or dislocating knee cap.
I would advise a re-visit, focusing on an orthopaedic exam of the back legs.
At the same time, we can re-check the anal glands to ensure they are still empty and have not become infected.
He may require some medicine such as anti-inflammatories or antibiotics.