Hope these quick links help. I don't have a dog, but my mother has a Pekingese that roughly falls into the same category as your Chihuaua. I've noticed it is challenging to find a pattern for a smaller dog.
I dunno....judging by that picture your male looks pretty submissive!? LOL
I don't think there is a specific picture for this pattern, the creater say's its open to creative interpretation...make one or two and you supposedly get the hang of it. But there are pics of other dogs wearing coats there (which I doubt will help). Still, it's a pattern specifically for a Chihuahua (designed for male or female):
A link to links of assorted canine patterns, some of which are custom-fit. Among the custom fits is a site where you can enter some measurements and other data and actually get a free custom pattern made for your dog, in a matter of seconds: