I'm not going to lie to you (although I usually do), I had no idea what a moon dog was when Geekologie Reader em_kay11 sent me this picture (high-res version HERE) of one he took early Wednesday morning. Per Wikipedia:
A moon dog or moondog (scientific name paraselene, plural paraselenae, i.e. "beside the moon") is a relatively rare bright circular spot on a lunar halo caused by the refraction of moonlight by hexagonal-plate-shaped ice crystals in cirrus or cirrostratus clouds. Moondogs appear to the left and right of the moon 22Â° or more distant. They are exactly analogous to sun dogs, but are rarer because to be produced the moon must be bright and therefore full or nearly full. Moondogs show little color to the unaided eye because their light is not bright enough to activate the color photoreceptors in humans.
Cool, a moondog! Can we keep it, daddy? Can we pleaaaase? I'll feed it and walk it every day. And if it ever moon-cheeses on the carpet I promise I'll clean it up and spray the area real good with pet odor-neutralizer and everything. No? Well how about a reptile? I like turtles.
Thanks em_kay11, now how about a mooncat?