Does a leveling kit void the Toyota Tacoma warranty?

I let my dog ride in the backseat with me on errands sometimes, and I noticed that his nails have scratched and even punctured the seat cushions in places. My seats have fabric upholstery and I was wondering: how do I fix a car seat cushion myself?

How come skidding on ice is considered at fault? Last winter, my car slid off the road and hit a few trees. I was ok, but my vehicle had a lot of damage to it. I was shocked when I saw my renewal premium and learned it was considered an at-fault accident. There wasn't another car involved, and no one can see black ice.

I was driving when another car hit me from behind. I don't have the money to fix it, and it suffered significant damage. That said, I still need a car to get to work. Will the other driver's insurance provide me with a rental car?