Hey feller, well done for being brave enough to post these and ask for input on a photography forum.
A couple of comments to begin. It's very tempting when you have a good camera and a zoom lens to get in as close as possible, as you've done here. Generally a subject needs some space around them to give them a little movement, and especially ensure that important bits of them don't get cut off. A corollary to that is to be aware of the background, and to either chose to shoot an animal against a bland BG or use a lens with a large maximum aperture to through the BG out of focus and blur it.
Other stuff: it's good that you've got the eyes sharp on No.1, and a little careful post processing could being out the colours a bit more. No.2 has nice colours, but the profile doesn't catch the viewers attention like it should, and the collard distracts from the animal and becomes the focal point.
Keep shooting though - practice makes perfect.