Im thinking rat terrier and chihuahua or jack russell and chihuahua? This is the best dog ever. Chill but playful, good with kids, house broken, and has the sweetest personality without being annoying.
I checked your pictures, the combination might include a Corgi (the ears) I don't think it has any Chihuahua in it,they have the most annoying bark especially if they get excited. I do think one part is JacK Russel.