[Haiku Guy]

Solution: Larger dogs.

[JohnLongIsland]

Solution: Larger dogs.

Imagine five pitties from an inner city animal shelter, watch a mountain lion disappear in a hurry.

[Bulwyf]

Black and tan coonhounds:)

[BornToBeAmerican]

Solution: Larger dogs.

Or: Smaller doggie doors

[GGpaX4DumpedTea]

Solution: 12 ga pump

[TruthWillWin]

Solution: Larger dogs.

Or smaller dogs that require smaller doggie doors. Actually the door we got for our Yorkie is really a "Kitty Door" but we don't tell her that.