Canis Minor, the little dog:

A very ancient constellation, Canis Minor is the smaller of the the two hunting dogs used by Orion. The constellation is one of the smallest in the sky and is composed primarily by only two bright stars. Canis Minor can be found by looking above the constellation of Canis Major. The star Procyon, along with Sirius in Canis Major and Betelgeuse in Orion create the asterism known as the "Winter Triangle".