Never had a problem with the dog door, but this one has super-strong magnet closers, being designed and insulated for harsh conditions like Minnesota winters and Labrador Retrievers. I'd forgotten that it takes a little more time to get the pup to learn using the door, but as of now, (four months and 30 lbs.) she whacks it with her paw to break the magnet seal and bombs in and out that way.
Far as I can see, the likelihood of anything sneaking in is laughable. The dogs get to know the sound of that door opening to the point that if a strong wind happens to crack it even a smidge, they erupt into full-ballistic-invasion mode. Even in the middle of hard snoozing at night. Proven too many times, the difference between dogs and cats....
Skunks supposedly make great pets and act like cats. Wouldn’t mind one or two around. They do great at eating all the little bugs and such. Right now that job is being handled by several possums who are hanging out around here
I had a pet skunk when I was a kid. I never believed in bringing wild critters into the domestic world, but as is almost always the case, his people wanted to get rid of him after he reached adulthood. He'd been de-scented and neutered, and was a very pleasant-tempered and fun creature. His situation only proved to me in stronger terms though, that wild needs to stay wild. A coyote pup passed to me (dumped on me) because his welcome also ran out - same story, same lesson.