Don't leave a horse blanket in a hot car

I am your typical mini van mommy.  I haul everything in that van.  This included the horse blankets that need to be washed.  With all the warm weather my car is starting to small like the elephant pens at the zoo.  Oh my!  I really need to get those to the cleaners.  When my kids roll down the window the minute they get in the car you know its bad.  LOL