[Gimp-user] Dog image

[John culleton <john@wexfordpress.com>]

This is a newbie question. I have read the Manual and also "Grokking the 
Gimp" but I can't quite figure out what to do.

I have a photo of a dog. I want just the dog on a transparent background in a 
jpeg or gif file to put on a web page. I can select the outline of the dog. 

Now what do I do? do I move it to another layer? Please indicate step by step 
how I get to just the dog with a transparent background.

Also, should I use jpeg or gif for the final image?

All responses appreciated.

John   Culleton