Is it possible to make a picture that is stored on my computer smaller? Yesterday I got my dog vaccinated and I received a small tag from GetMeHome.ca :: and wanted to add a photo of my dog to his profile(in case he ever gets lost) yet it says all my pictures are to big.

Yes. There are many free image editors out there. If you click on the following link, you will find some.

Free Image Editor - Google Search

I like to use IrfanView. It's free and available via the following link.

IrfanView - Official Homepage - one of the most popular viewers worldwide