We recently adopted a black and tan hound puppy from the animal shelter. He's a great dog, very sweet and smart, but we're having some trouble 

otty training him. It seems that he's grasped that potty means to pee outside but he isn't getting that it means to poop out there as well. When I take him out and tell him to go potty, he pees and then looks at me for praise but he never poops in conjunction with peeing.
Oftentimes, I could be outside with him for 20 minutes before he poops (except for when he first wakes up in the morning, then he goes instantly) and he often poops about 3-4 times a day so it's always quite a production. If he doesn't poop when I'm outside with him and I bring him back in, he'll just squat down and poop whenever he wants - right in front of me. I do the whole "Eh" thing and grab him if I can (sometimes he runs from me) and take him outside and tell him to go potty there.
I'm almost wondering if I should come up with 2 different words since he's not getting that potty means both? I'm also wondering if there's any way to train him to tell me when he needs to go out since most of the time I have no idea until he's doing it in the house. Once in a while he'll go to the door (to which I'll praise him to no end) but he never whines or barks so I just have to watch him and wait for him to go to the door. Any ideas or suggestions?