Hi John,
Federico is right, rel="dofollow" doesn't exist. To expand upon that a bit, every link is assumed to be "dofollow" by default unless you add rel="nofollow". So if you want link juice passed through your links, you don't need to do anything special - just build the link as you normally would. If you don't want link juice passed, you would need to add the rel="nofollow" tag.
Tim