The dog site I visit the most has to be this one

For dog food I go to http://www.petfooddirect.com.

And here is a website with a list of dog movies -- http://www.boxofficemojo.com/genres/chart/?id=dog.htm

Sometimes I go to Cesar Millan's website 'cause I like reading profiles of his pack members. Here a link -- http://www.cesarmillaninc.com/

I always check dogs that are available at a local animal rescue where I got one of my dogs, which is called Last Chance Rescue -- http://www.lastchancerescue.org/

Here is a helpful dog breed FAQ website -- http://www.faqs.org/faqs/dogs-faq/breeds/

And lastly, I visit my friend's website where she creates original Doberman Pinscher cartoon strips called "Dobertoons." Great site for Doberman lovers -- http://www.dobertoons.net/

There are probably a few more that I can think of at the moment.