Get him on a strict feeding schedule. Take him outside to pee/poop 20-30 minutes after he eats. Take him out 3 times a day- morning, afternoon, and evening and praise him like crazy when he goes. If he's still going in the house, take him out more often (i.e. every 3 hours). You want to make sure that you give him every opportunity to go outside. Give him a treat as well.
Remove any pee stains in your house with an odor remover so that your dog doesn't constantly pee on the same spot.
I also recommend crate training him. Dogs have a natural tendency to NOT soil where they sleep. Make sure the crate is small enough so that he has just enough room to turn around and lay down comfortably. Get him used to the crate by putting a blanket, treats, and toys inside and let him walk freely in and out as he pleases in the beginning. Take him outside right after you take him out of the crate and praise/treat when he goes. As a general rule of thumb, the maximum number of hours you should crate a dog is his age (in months) plus one hour. For example, a 2 month old dog should be in a crate for a maximum of 3 hours. An adult dog should not be in a crate for more than 8-9 hours total.
If you start to see that he's sniffing around and if he looks like he's about to pee, take him outside (just pick him up and carry him out immediately) and praise him when he goes outside.
Hope this help's
