Does anyone have any experience with plantar warts on dogs? If so, what became of it? Is this even a wart at all?

I just discovered it on her paw pad a couple days ago.. We went to the vet and he said it looked like a plantar wart and if it grows, bring her back and he'll laser it off. Otherwise watch it and it *may* dry up and fall off..?? How long will that take? How did she even get it? I have no experience with warts at all, let alone warts on dogs..

Luckily it doesn't seem to be causing her pain. She's walking like normal and isn't licking at it.