I've seen the surgery done quiet a few times - your vet's right, it's not a big deal, just lots of suturing. The incision should be pretty tiny and I'd say keeping them from jumping or running too much afterwards would be the hardest part about it. But as long as the vet does a good job and uses the right sutures for each layer and ties them off well (can't imagine any vet not) it should hold up fine even if the dog does play during recovery. If they give you pain meds, use them sparingly, even though of course you don't want your dog to be in pain, a tiny bit of soreness for the first week or so will help to keep him more calm and give it a better chance to heal faster. All in all the surgery itself is less invasive than a spay, so don't worry, it'll be fine
