They are not bad, but for me they are a little tightly cropped, but I guess that is maybe a style difference between how you photograph them and how I might do it. In the left one, his ear is fuzzy, (out of focus?) and in the right one, it only seems to be his eye and the area around it that is in focus. I am not sure if this is of concern to you, but if you are shooting animals, unless the owner is in to a more artsy style with the appropriate amount of bokeh in the right places, then I would suggest that you want to get all of the animal in the image very sharp. Also, for me, the right one is a little strange as I can only see his left eye. If this is meant to be a "portrait", then both eyes should be showing and they should be sharp with perhaps, a bit of a catch light in each one. The first one bothers me a bit, because when I first saw it, I thought maybe the dog was ill or something - not sure - but he looks all wrapped up which, to me, is a bit unusual for a dog, but maybe not for yours. I am not sure if you have done it, but if you haven't, I would suggest that you do a Google search on "dog photography tips" and look through some of the articles and images that you get.
You mentioned that your dog is a puppy and that - He's very hyperactive and getting him to sit still long enough to get a decent focus can be tough - why not use that to your advantage? Increase the shutter speed, increase the ISO a bit if necessary and get pictures of him being "hyperactive". Sitting still is not the norm for most animals, well, except maybe cats as with their very high metabolism, they sleep a lot. For dogs, they are all active - use this to your advantage - check out the web and you will see what I mean. HTH.
WesternGuy