Welcome to YT! This is a great site for information. Lots of nice people.
I have a 5-1/2 month old Yorkie 3 pounds and a 4 year old Yorkie 4.5 pounds and 4 other big dogs; a German Shepard 110 pounds Lab Mix 40+ pounds and a blue heeler mix 60+ pounds and a 22 pound Jack Russell.
They all get along great all the bigger dogs are very gentle with the two Yorkies; that said I never leave the Yorkies alone with the big dogs only because the big dogs could hurt them without trying, just by playing to rough.
Yorkies are awesome fur babies. Give it time and the Yorkie will have you and everyone else wrapped around her little paw!
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Tracye - Onni's, Bonnie Blue, and Bella's MoM

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