Why does everybody always want somebody else to tell them how to tune their small dogs? Just experiment! Tune his left front leg to a D. Then tune the right front leg to whatever note you think makes a pleasing interval. Continue on around the whole dog and then strum the thing. If it sounds good just play around with it for a while and see what happens. Try "Soldier's Joy" or something and see if the fingering is comfortable. If it doesn't work, just start over. Just be careful not to break any legs.