I have an adult small breed mixed dog he has been house trained since we found him about a year ago. We are foster parent and have had teenagers in the house since we have had pablo, but now we have a 2 year old girl and a 4 year old girl, he has started peeing on everything that belongs to them. We also have a new puppy she is 5 months old and she has also started peeing in there bedroom. PLEAS HELP!!