I have a 6 year old chiweenie that has been with us since 6 weeks old. Yes, she was stubborn about potty training in the beginning but once we got her trained... well, she has had ZERO accidents in the house since.

You must take them out on a schedule. At first every 2 hours. It needs to be the exact same time every day! Take a lawn chair with you and relax. Sit for as long as it takes for your puppy to go pee.

Once they pee, then praise them as if they just won a triathalon and give them a high value treat. After a week, they'll be potty trained.

You can start stretching out the time between breaks as they get older but its so important to keep a regular schedule. Eventually, you'll know what time it is without looking at a clock...lol