#5 is good.
See the shots where he is blurred? The plants are pretty much in focus, so you just need to learn to pan with the action. Takes practice.
The underexposed shot(s) can be improved using fill flash.
I can't read the EXIF on these shots, but I suspect that your shutter speed was too slow for when the dog is running toward the camera. Flash will help a lot to "freeze" the motion.
When shooting two subjects, get them both in the frame. Or if you wish to isolate one subject (dog) then you need to get closer and frame tighter to avoid the man being in the picture.