[Critter]

My daughter recently got a yorkie-poo, one of my dogs, Harley just hates him, it's been about 3 months and we cannot get them to be friends no matter what we do. Harley usually loves most dogs, so I dont get it, he is the easiest going dog but for some reason this puppy comes around he avoids him and if he manages to get too close he growls like I have never heard him growl before. He has never tried to bit him, but I am worried. The puppy has even been very submissive with Harley but it doesnt seem to matter. I feel bad because my daughter want to bring him over here when she visits but its gotten to the point where I dont want him here because Harley has such a bad reason and then Harley marks all over the house when he leaves (something he doesnt normally do). I don't know what to do. I want them to get along and its starting to hurt my daughter's feelings that she cant bring her puppy here. How can I help them to get along?