Poor Tardar has a whole host of genetic messiness. As well the grumpy face there's also a mild bit of dwarfism (hence the short legs, and fear of heights). Also, heterochromia, although as Professor X will tell you that's a groovy mutation.
Some local animators have been having fun with 12 Days of Gifmas. There are some odd ones. Worth a look. Forced myself not to post the maids milking...