Is it ok that i made a bed for my dog in the back seats of my 1999 audi a4?

i made it for him and he sleeps there. hes not in there all day. but is this ok to let him atleast sleep in there?Is it ok that i made a bed for my dog in the back seats of my 1999 audi a4?Sure, why not. Now, leaving him there during the day is iffy.... Don't want to let him get too warm.

miata