Thanks! I am eager to see what he looks like when he is full grown! I definitely don't think he has any Rottweiler in him... he is just too small. I have been looking up different breeds of Terriers to see if I could find one that resembled him or his mother. Anyone care to take a stab at a guess as to what kind of Terrier he may be mixed with? I am attaching a photo of Riley's mom to help out.