If you have found your dog peeing in your house then you should know that there is a reason for this. It may be that they have a Urinary Tract Infection and you should take them to the vet. It may also be that they are marking in the house and there is a remedy for this as well. It is important to understand that dogs do things for a reason and understanding this makes it easier to fix the issue.
Scent marking is where a dog pees is a certain spot so to let other dogs know that this is there area. Dogs have a much better sense of smell than we do this is why they use this method. Some dogs are more prone to do this than other dogs such as male dogs are more likely to pee to scent mark than a female.
Also you will find that smaller dogs will also do this over larger dogs and if you have two dogs in the house you may have a conflict with them even if it is a small one they can still mark in the house.
Usually this is caused by some kind of change such as a new dog brought into the house or maybe even a new baby can cause a dog to mark his territory.
What you want to do is to first clean the spot very well to get the smell up. It is important that you watch your dog the next time he gets ready to go there are do this you nee to distract him. You can use anything that makes noise this will help him to understand that he does not need to mark this area.