The duck picture has some promise. I'd crop the bottom and right to eliminate those disturbances in the water. I'd like to see only duck, water, wake.
The dog shots are, I'm sorry, less interesting. The first and last are overexposed. The middle two are better but you still have some blown highlights. Bright overhead sunlight is very harsh and it's difficult to work with. You might understand why photographers like morning and evening light better. What would also help would eye contact with the dog, or something with more action. The shark dog shot might have been better, for example, if he were turned the other way and looking at you, or if you could catch the motion better, make it seem more dynamic. Try getting down to the dog's level and getting a lower angle.
The last one also has some potential. I like the shallower depth of field to try to isolate the subject and help minimize the background, which is a little bit cluttered. The lighting is tricky - it's partly in shadow and partly in some very bright sun, which makes it tricky to get a good exposure. If you expose to get more detail in the shadows, you're going to get blown highlights, which you do have. But you could expose for highlights and lose a little detail in the shadow - in this picture, you wouldn't lose too much and it wouldn't be important detail anyway. As for composition, I would have shot a little bit further to the right to get the ends of those antennae-looking things and less of the fern in the background.
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