As for pet doors, the biggest problem we had with one on the garage was a possum coming in and sleeping in a cat bed.
Not my photo but you get the idea
Very funny! We have five cats. Our last home had a daylight basement with a door below our bedroom window. We installed a cat door in it so the crew could go in & out as they pleased. Well, a cute young female raccoon found the door & came inside. Finding food, she would come by frequently for a treat. Happily she left the cats alone.
One day I heard a ruckus & looked down at the door. There was the raccoon with the cat door stuck around her hips. She’d gotten quite plump on kitty food. She stood up & the door slid off. She hustled away, never to return...until the next spring. She brought back her three kits & sent THEM inside for a meal.
Smart raccoon!