The OP never said a dog over a certain size was "big" but even if she did size is in the "eye of the beholder"
. I'm 5"0 tall and petite so ANYTHING over 10 lbs is big to me lol but to my husband who's 6"3 a great dane would seem like a medium sized dog. Alot of things do depend on the dog as an individual but I think generally speaking most who have owned a "tiny" AND larger(normal)sized yorkie(breed) do see a difference. Maybe not alot of differences but there are some. All these differences or similarities are based on the individual's experience.