I love tiny dogs and giant dogs. Hence, why I have a yorkie and a great dane, LOL. (Complete opposite ends of the spectrum!)They're actually "his and her" dogs. Roxie is mine, and Thumbelina (the great dane. haha) is my husband's.
Of course I care about both of our dogs, but I love my little Roxie because-
her tail doesn't leave huge welts on my body when she gets excited.
she doesn't leave gallons of drool all over my kitchen floor after she drinks.
her poop isn't bigger than my 6 month old son.
she can go everywhere with me.. stores, family events, etc.
she can't eat all of my food off the table & counters as she walks by, LOL.
I can bathe her with one hand.
she is so much fun to shop for!
none of my neighbors or friends are nervous around her.
I walk her, she doesn't walk me!
she is extremely portable, as someone else said

the cuteness factor is SO high!
I have a bunch more, but I'm really tired and I need to go to bed, lol.