I recently aquired the cutest dog sweater book, Doggie Knits by Corinne Niessner. The shaping is really straightforward and the patterns are super simple with suggestions for embelleshments. Several of the patterns fit odd-sized dogs like my little French Bulldog :D
The Big Penny Sweater is ribbed along the back with simple increases. She uses the same armhole shaping technique throughout the book. This is an ideal first sweater because the pattern is very straightforward and the ribbing gives a lot of leniency to the fit.
Another shot of my progress thus far. Just over halfway done with the increases before starting on the armholes! This sweater is made with a heavyweight yarn so it goes pretty fast.