I'd do it. There is a 1 in thousands chance something could go wrong. But he could also god forbid get hit by a car. Things happen in life- there is risk in everything. As long as you take the proper precautions, get pre-op blood work done and go to a trustworthy vet, chances are extremely slim of anything happening to Rolo. Unless a dog has an underlying condition (which blood work will usually find) or the vet makes a mistake or there is some very rare circumstance- like if the dog is allergic to anesthesia- there is very little risk.
Does your vet use gas anesthesia? It's safer for our little ones. And they come out of it faster. Toby had gas anesthesia and he was fine when he was neutered at 3.5 pounds.
In the end, you have to do what you feel comfortable with.
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