Just a note, using a laser doesn't mean there is no cutting. It is just cut using the laser. It does reduce bleeding, and they likely used internal sutures and some skin glue to close the incision. Spay incisions are so tiny these days, no matter how the surgery is done, that the dog is just left with a tiny mark.
We do laser tumor removals at work, which really does help cut down on bleeding. Especially on the dogs with huge surface tumors that have been growing for some time.