Those of you who have and love dogs will not be surprised to learn that as long as people could take photos, there have been dog photos. And mind you, this was back in the days when the subject had to sit really still for minutes on end. Imagine what good dogs those must have been.
The American Museum of Photography has a few you can meet. Look for the portrait of three boys -- oh, who's that fourth one? Why, he's not a boy at all, surprise!
There's also photocollages by Mary Wright, who in the 40s and 50s carefully matched dog heads just so to the perfect fit among her collection of old photographs. It's funny how dogs' innate yet comical gravity translates to the stiffer outfits and manners of yesteryear.