So this little guy will go outside with my beagle, play and stay out a long time. As soon as he comes in the house he will poop and pee. I just don't get it! I've never had to potty train a dog before, all of them have come trained already, so I don't know what to do. When we are outside I talk to him, even say "Look at your big brother going potty outside". When I do see him go outside I praise him. One good thing is he does go in the bathroom, mostly, so that's easy to clean up. But I'm getting frustrated and just don't know what to do.

TIA

Julia

Julia, that doggie may have been trained to go on a pee pad in the bathroom at the house of its former owner. You may want to try walking your new doggie by itself for awhile as the other dog may be a distraction. Aside from watching to see if the dog has specific times he does his potty.........my dog does............you'll have to take him out frequently and do the reward thing when he accidently does what you want him to. We have so many posts about this I don't know what to offer somebody hasn't offered already.

It's frustrating to bring a new pet into the house that isn't as well behaved (in house training) as your other pets, so I fully understand how you're feeling!
My advise is to pretend this is a young puppy and start house training from scratch. I would start by taking him out, without the beagle, in the yard and stay with him until he goes. Keep him moving, don't play with him and don't talk until you see him go. The instance you see him either pee or poop, give a command you want to use from now on, then give him lots of praise. I always say 'go tinkle' and 'do your business' to my dog and he will now go on command......or at least try! :~)

There is much info online regarding house training a dog so I'd advise you to read some of the articles.
I've included one that covers basics, but it may be of help.