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This is Belle, and she is described by her owner as a Chihuahua. However, I would argue that she is not a purebred, but instead is part miniature dachshund. Her floppy ears, fairly short legs, and other characteristics seem to imply this. So, what's her genotype?
Belle appears to be tan pointed. Though it is difficult to see, a smudge of red seems to be present on her cheek. Her other cheek is white, so it cannot be examined for the presence of more tan. This would make her atat tan pointed.
This dog is also clearly liver, with the classic brown nose and yellowed eyes. This would make her bb liver.
As for the red on little Belle, this appears to be dark red, blending in rather will with the surrounding liver hair. This means she must be CC dark red.
Next, Belle is piebald. She is in the moderate range with a bit more than half of her body being white. I highly doubt that she carries extreme white piebald, and as such she must be spsp piebald.
This dog is also ticked, as can be seen on her legs and face. Whether she carries non-ticked is difficult to say, but since her ticking is fairly sparse I believe that she is Tt ticked carrying non-ticked.
So, that would be atat bb CC spsp Tt or piebald liver and tan with ticking.