My dog doesn't like having his front legs wrenched around to put on a sweater with armholes or sleeves so here are the patterns I came up with for some designs that slip over the head and then fasten under the stomach with a button or two. They are knit flat in one piece with very little finishing required.
The patterns are for sweaters to fit dogs with necks measuring from 10 to 12 inches and girth (around the body behind the front legs) of 15 to 18 inches. I have included a lot of notes including a section called "concept notes' that could be helpful in modifying the pattern to make other sizes but I only have instructions for the small size.
Both patterns start out with a ribbed neckband and then a raglan sleeve section, which isn't a sleeve at all -- more like raglan shoulders. I called the one with a band of ribbing around the bottom the sporty cropped sweater but it may only be "cropped" on my dog since he has a kind of long body. That's my dog, Finn, in picture #2. He wasn't a very cooperative model so I enlisted stuffed toy dogs to show the sweaters. The other design I called the turtle back sweater. It starts out exactly the same but then has a rounded back with a belt instead of the band of ribbing.
The sweaters are pretty easy and quick to knit up and the skills required include casting on, knitting, purling, increasing and decreasing, buttonholes, and binding off. I have included instructions for doing a cable cast on that works nicely on the belt sections of the sweater, and instructions for how to make a one row buttonhole. But you can use whatever method you prefer for casting on at the beginning of a row or making a buttonhole.
The patterns come in a PDF file format which can be read using the free Adobe Acrobat Reader that you can download online. The file will be will be available for instant download upon purchase. No physical item will be mailed to you.