Luca is adorable...
I do see Yorkie
traits so thats no question but his size does suggest there could be something else in the mix. He's such a cutie!!!! I know exactly what you mean about the biting and pulling of the pant legs...it breaks my heart when my Cookie tugs at me and gives me this look as if to say "don't go, stay and play w/ me some more!"
They know how to melt our hearts!!!
-RubyC