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					Originally Posted by milomlo  Ok thanks!  Now let me ask this.  I have a male now who is neutered.  He does hump sometimes but nothing major and I haven't "seen" him mark anything.  Is it different if they do get bred?  My yorkie was fixed right after I got him (at whatever the appropriate age is). 
I did just ask the owner of the pup and she does not know his blood lines.  She says he is AKC registered and Full blooded.   | 
 
  Yes, stud dogs mark their territory.   
Just because a dog is nuetered does not mean their instincts are removed, they will still hump. 
If you want to do this breeding thing, I would suggest that you find a female with a good pedigree.  AKC/purebred doesn't tell you a whole lot about it's background.