Welcome 
I love the first one. You focused on the eye so it is very detailed and sharp. The exposure looks pretty good and I really like the composition. The fact that you can see you in the dog's eye is a cool touch. Looking at the Exif info from the pic, I think that you got lucky that the pooch was holding still. 1/80s is pretty slow for shooting animals. If you bump up the iso to 200 or 400, you'll get a much faster shutter speed and it will keep you from getting a little blur when photographing animals (I've learned this from painful experience).
The second one looks like it has a lot of potential, but I found some things that may have kept this from being a great picture. The 18-200 isn't a bad lens, but typically speaking, most lenses work best when not at their widest aperture. You shot this one at f/3.5 and at 18mm. These two combined will soften the pic a little and hinders the final 'crispness' if you will. Also the pic was shot at 1/45s, which more than meets the 2x the focal length for shutter speed. Again, a higher iso would have helped. Also I think the horizon is a little off as well, unless that was your intent 
Overall I really like both of these pics, the lighting is really good (which is something that I've struggled with since I started shooting), I'm really diggin the sharpness in the eye of the first one and the expression of the dog in the second one is very peaceful and content.
Keep on shooting and posting, I've been hammered by folks here about this and that, but they were being helpful and it's made me a better photographer. I look forward to more posts!
Cheers