that is just your average run of the mill "fire-bellied toad." They are very common in pet stores, he probably escaped his enclosure.
According to some sources they have a very mild toxin they release from their skin to deter predators such as cats and/or dogs. But that is a last resort if the flash of their red belly isn't enough... as you may know many reptiles and amphibians sport bright colors to signifiy that they are poisonous, and not to be messed with.
But unlike many of their african and south american cousins (poison dart frogs), fire bellied toads are just very good at bluffing! But that dosen't mean you can go around licking them either... and as good practice always wash your hands before and after handling reptiles and amphibians.
Ofcourse I can't forget to mentinon that they also make great pets.. I had several in a vivarium, they actually learn to recognize you as a signal that it is time to eat... and they make cute little chirping croaks.