My male did this from day one when I got him. He was right at 5 months when I brought him home. I think he picked it up from the kennel, maybe watching the other dogs. At first we thought we had been lied to about his age, but the vet confirmed he was around 5 months... so... good luck! Mine still likes to mark my dads recliner when I take him there, even though he is potty trained. |