We have had our Doberman puppy for a month now and potty training him is starting to feel impossible. He just doesn't seem to understand the concept of going on a pee pad, but he knows how to go when let outside but he doesn't tell us when he needs to go. Its usually just a hit or miss. Every time we catch him in the act in the house or even after the fact, we tell him "outside, this goes outside" then we put him out there to show him, but despite our efforts we are making no progress, it just feels impossible. Any pointers or advice? This is my first doberman.