My male, Corin, is a marker. He is 14 mos old, and likes to mark curtains, or hanging clothes. We were at a puppy play date with his breeder and several other pups from 2 litters when he was 8 weeks, and the little stinker tried to lift his leg at the play date. Everyone was like "Whoa, and he is going to be yours" 🙂 He has marked ever since we brought him home at 12 weeks. He even marked me once when I came home from work. I'm a vet tech so I smelled like other dogs, and even though he had just been out, he lifted his leg and peed right on my scrubs.
His dad, Kita, is a marker too.
-Nicole