very simply, jpeg is a compressed image, most images are jpeg because its good quality and small.
RAW is information straight from the camera that is not compressed and can have a lot of modifcations done in post processing

more info here
http://en.wikipedia.org/wiki/Raw_image_format

Thank you kind sir. Keep up the good photos with your dogs.

You're welcome, Happy shooting!

thanks. just change the adjustments till you find something you like and youll learn it

That was some really good editing!!!

I dont know how you did it, but the outcome looks marvelous

Wow, they are both incredible shots! You did the "infra-red" adjustments in photoshop?

interesting i have a very close shot to this. i dont really care for it but i thought id post anyway.

i like the secnd color one posted. b/w is awesome but it's chaotic in the first lol.

Neat pictures, I liked it at first but it kinda got a bit too crazy and messy. I think I prefer the colored version because it's more clear. The bw version looks like wintertime but it is not. I dunno.

That color one is pretty neat too. Nice green gives a nice blend to the sky.