Cat Shock Collar For Doorway. You might just have to get rid of that rug. Put a sign by your cat's favorite door warning visitors to keep an eye out and close the door quickly behind them.
Of course it will become cruel if your shocking your dog over every little thing. Check/replace batteries in receiver collar. A shock collar can be a cheaper alternative to a professional dog trainer or fence.
Plus, it's more affordable than our first pick.
Press and hold the mode button until the green led light is on. So unless you put it right in the middle of a doorway it will not cover an entrance (typically 3 ft). Because the collar may come off, you should also have your cat microchipped so that your cat can be identified with or without its tags. The petsafe wireless indoor cat barrier is safe, easy to set up and very effective.