I'm in a bit of a hurry since I've got stuff cooking at the moment.

Mocha appears to have a rather fine muzzle and very slender legs. The coat color is agouti (black tipped sable) which is a rather common color. The black hair component is dominant over breeds that do not carry the 'E' gene which is for Extension of Eumelanin. Dogs which have 'E' will have black whiskers. Dogs that are from breedings of 'e/e' dogs will have pale whiskers.

So a quick look, shows that two dogs that did not contribute modifiers for a shorter coat (which would be more dominant and thus since it isn't there...) I would guess at papillon and a golden retriever. That's only a guess. I do not know why Chihuahua was suggested as a possible known (was the dog surrendered from a home where the mother was known and definitely a Chi? I don't know that). Some purebred dogs are not really typical of their breed. And many pets are not the result of two purebreds.

The amount of white would be about right for this Pap and GR genetic mixture. As well, it would affect ear carriage giving an ear that is neither completly flat nor an an ear that is erect. The muzzle of the golden has more bone and in crosses like this, but mixed with less bone - less bone tends to predominate (Willis, "Genetics of the Dog")

Whatever the breed, Mocha looks like a very handsome dog. If a Pap and GR mix, then I'd anticipate a very active smaller dog of the medium size (shorter than a pure GR). This mix would probably have a very happy go-lucky personality and 'smarter than their owner' sort, figuring out puzzles and possibly being very good agility dogs with a strong will to please. That's all guesses tho.

M&M, you could always make up some breed name. Most people don't know breeds very well at all. Transylvanian Long Coated Spaniel works for me!

Okay, back to kitchen.