I find reading mythology very interesting. It tells so much about the place where it came from and its people. Illiad and Odessey is a particular favorite. I also read shakespeare and Dante Alighieri. I easily forget some of the stories I read so i re-read them from time to time.
Dogs and animals are great subjects but somewhat a hassle sometimes. Sometimes they don't keep still and they would rather lick you or ask for a pat rather than pose for you. If you are a dog lover then I would suggest that you go out of the house instead of shooting indoors. Always find natural...
Reading would totally be a good start. But it would also be good to wean him away from the TV. The TV shows now does not encourage kids imagination because everything is presented to them in a silver platter. It's the same thing with other gadgets.
Ask him what he wants to do and start from...