1.) It takes longer than you think
Why is my potty trained puppy having accidents? The most common answer is...they’re probably not trained yet.
It’s easy to get super complacent and overconfident after a few clean days. You might assume that you are a wee wizard and that your pup has it all figured out, but 9 times out of 10 it takes longer than we think to fully potty train a puppy. It can take 6 months, or sometimes longer, to fully cement the concept.
Once you’ve had at least several accident-free months, you can be safe in the knowledge that you’re pretty much there. How to fix potty training regression? It can be perfectly normal for regression to happen. After all, if we slack off on our duties our puppies will too. So go back to basics and set the foundations again. Your puppy will remember fairly quickly this time too, so it should be smooth sailing from there.