Wow, you guys are too kind. The suit itself isn't hard to make but fitting it properly was a bit of a struggle. I don't think I would attempt to make one for someone else - it would be hard to make one that would stay in place securely without having the dog here to refine the fit.
For those of you who would like to make one yourself this is the pattern I used to draft a pattern that would fit Frankie. It took a few tries to get it right. I should have paid more attention in algebra in high school
Woofy Wear Dog Clothes Coat Costumes Pattern Sewing Size s M L Simplicity 3939 | eBay
I also used my Japanese pattern book for inspiration
I made it in 2 parts, like in the Japanese book, and then sewed them together. It makes it easier to fit the length accurately. The Japanese pattern books are great - they have really cute patterns in a variety of sizes and I find they fit better than North American patterns - but they *are* written in Japanese. They are well illustrated, though, but probably not for beginning sewists who need directions to follow.
The pattern for the boots came from here
Sew Your Own Winter Dog Boots | so you wannabee a Domestik Goddess?
If anyone wants to try making a snowsuit feel free to contact me if you need help. I've already made all the mistakes