This pattern is a free one I found on Ravelry called the Long Sleeve Turtleneck Dog Sweater. It was easy to do until I got to the added on edging in the back. I finally made it work and look nice, but it was a pain. I much prefer patterns with little or no finishing.
Anyhoo, it fits him well and will be really warm. We took it for a test drive walk this morning. It was pretty cold ~ about 35 degrees, despite the sun you see here.
Next up in the dog sweater realm is the Soho Cable pattern that Mr Jeffries has made so popular. I finally got the pattern from Lion Brand. It's not free and not downloadable despite what Ravelry says. I complained about that (download-ability) with no answer from the company. I mean really- $4 for shipping a piece of paper that cost $4 to buy??? That's outrageous. I plan to use the pattern repeatedly for a price like that.