I didn't start out to make quilts for dogs but I made my brother-in-law and his wife quilts for Christmas one year - which they raved over. The next time I visited them they were happy to tell me that the quilts were being put to good use and that their dogs love them.
Also, when I make a baby quilt, if there's a pooch in the house, I make a small checkerboard one out of the colors in the baby quilt for the mom to put in with her newborn for the first day Then the little quilt comes home so the dog can get the scent of the baby. That little quilt then becomes the dog's.