Now, I will evaluate your model so far.
First off, his head looks very awkward, it needs to be facing down, not looking up. Next, his ears are positioned wrong, refer to my reference picture. Make the whole body more stubby, and, add some muscle to his front leg, as you can see, it is quite a bit more muscular than what you've done. You've got the tail all wrong, fix it. Houndour also has a muzzle. The last thing I see that you need to fix are the 'bones' on his back. Yours are too long and thin, make them short and fat.