What a gorgeous creature! The wings are probably my favorite aspect of this drawing. The morphing from feathers to membrane is a glorious idea. Also those padded feet are so adorable; I just wish I could run my fingers over them. I can imagine the dog padding of them quite well. I love the implied glass that he is "standing on." It makes me think his claws are 'tinking' on the glass and reflecting his image on its surface.
Also, gorgeous muscle structure. Another fantastic piece. c: