Couple quick C&C's on the dogs.
First dog shot...Great angle! Always try to get down to their level for maximum effect. Depth of Field is ok but the focus point is off. Always try to focus on the animal's eye as that tends to be one of the most common "eye draw" points when someone looks at a picture. Aside from some fill-flash to bring up the shadow, not too bad.
Second dog shot...better lighting but needed to get down lower for more effect. Also needed to be a bit more to the left. For shots like this with "harsher lighting" you want the sun to be somewhat behind you but not totally....over a shoulder if you will. Puts more light on the subject, moves any potential shadows, etc. But the lighting you did have also helps to make some cool effects as can be seen if you look at the dog's eyes in that shot.
Overall, since you said you are new to the DSLR world, I think you are off to a GREAT start! Keep shooting!!!