Katie has a Hurrta fleece jacket that I love. It has been discontinued, and I love it so much that I bought a spare one. It is not as warm as their winter coat, but it is plenty warm. I bought my first one at GW Little, but the second one I got at Eurodogdesigns.com. On non sale items code Havanese10 gives a 10% discount. The jacket is waterproof and really well-made.
Hurtta Waterproof fleece jacket Waterproof Fleece Jackets for Dogs by Hurtta