My cat has chronically impacted anal glands and needs to get them expressed several times a year. It is very painful for him! I've been advised that he should get the anal glands removed surgically. Is this the right decision? I'm worried that there might be complications from the surgery because he is a small cat, and most anal gland surgeries are done for larger animals like dogs, and also because most vets don't do this regularly. Is this a surgery that should be done by a specialist?