Marking!! that was my bigee... I was so worried about him starting that, I know unneutred male yorkies, and its true, everytime they bring in something new, bags, groceries, etc, he marks them.
Also the aggression thing.
the sooner the better on getting them fixed, to curb the marking ( inside).
He still pees on every tree and post outside, but thats ok,, I just dont want it INSIDE!
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Rhonda, Bailey, Josie and my angel Bella Rue'
"Until one has loved an animal, a part of one's soul remains unawakened."
~Anatole France~