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Your dog is not too old, don't worry. Make sure to have pre-anesthetic bloodwork done on your dog before putting him under. If there are any red flags popping up on the bloodwork, the vet would not put him under.
Also, make sure they use an IV catheter for your dog. Usually, in seniors, IV catheters are standard before anesthesia.
The vet will also give him an age appropriate anesthetic like possibly Ketamine/Valium and maintaining on Isoflurane ( a gas).
As long as a dog is in good health, there are no worries. Think about it like that. if there would be an emergency with an old dog and he would have to have surgery, he would have to be anesthetized to save his/her life.
My Golden had two orthopedic surgeries a year ago, at age 8. My lab mix had two surgeries to remove a cancerous growth from his leg, he was 11.