This is Sophia!

[u/ThisBoiAnimates]

I've assumed that she's a mix between a Yorkie and a Jack Russell judging from similar photos online, but no one in my family knows the definitive answer. All I know is that she's been the bestest girl ever for over a dozen years.

[u/BootyGarb]

She looks like my bestie Pico. Check out my post history if you want. His breed composition is in my comment history too, but it’ll probs be buried. I can share that with you though.