The way you contact a seller is to setup a user account on our site (its free) here:

http://www.dogsnow.com/account_form.htm.

Once you have an account, you can either login and browse the classifieds or browse the classifieds without logging in. When you find an ad, you'll see in the lower right corner of the ad is a Contact Information tab. If you are logged in, you can fill out the contact form with your question/comment.  If you are not logged in, you will be asked for you username/password in the Contact Tab.  Once you login you can fill it out with your question/comment. The seller is contacted via our internal messaging system and notified of your message via email.  Some sellers also have listed their phone number in the Contact Information tab.  You can contact those sellers via telephone.