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Originally Posted by AprilLove Good vets will take size and age into consideration. Also it is very important to have a vet who is experienced with very small breed surgeries and does the pre-op bloodwork and physical prior to procedure.
My girl was just under 3 lbs at 7 months when she was spayed, and did well. Neuter procedure is less invasive (if both testicles are down) than a spay |

As long as your dog is healthy he should do just fine. My little boy was just over 2lbs at the time he was neutered, never had any problems.