My Jaci 4 mo has started this humping business he does it to my legs and if he is on the sofa with me to my arms.  I am a new Yorkie owner and dont really know much about the male traits and when they start doing this.  Is he really doing this or just playing?  When do they start? And when can I get him fixed? And should I tell him NO! when he does this? Sorry if this seems like a stupid question but like I said I am new to all of this.  Thanks! 
