Dog Sweater Patterns

There are a bunch of free patterns available at this site: http://www.knittingpatterncentral.com/directory/pets.php

And here's a website that lets you plug in your dog's individual measurements and the gauge of your yarn & needles and then cranks out a pattern customized to fit your dog: http://www.thedietdiary.com/cgi-bin/chart_dog.pl

You can also Google "knit dog sweater pattern." Unlless you know where a pattern is located, Google will find what you ask. You just have to ask correctly and adjust your search terms accordingly.