One issue witn a k9 car would be it may not have the rear seat. They normally don't have carpet outside of someone putting a removeable pad down. How the car smells or cleaned in general would depend on the officer and department.
I agree. But back seats are easy to find, the big issue with dog cars is where all the hair ends up. I found hair under the floor liner, stuck in the headliner, and in every crack and crevice. There was even hair in the H-Vac system.
Even if the car was cleaned regularly, and thoroughly, I’m not sure you could get all the hair and smell out.
If the car was cheap enough and in good mechanical shape, I’d say go for it, but expect to remove and clean/replace most of the interior. (Which actually isn’t hard once you’ve done it.) Including the dash.