What if I'm walking a Rover dog and it gets attacked by another dog and the damages are extensive. Who pays for that?
This happened to a neighbor (not on Rover) and the attacking dogs belonged to another neighbor who refused to pay for anything because they are low life scumbags. So my friend and the dog owner are like stuck with paying a $4,000 vet bill. The victim had multiple wounds that needed stitches and he spent 4 or 5 nights in the emergency vet hospital. Fortunately he survived.
Did your neighbor report the attack to animal control? That would be my first step and then perhaps court for the vet bills, though you may need a lawyer for that .