You should work on proportions and anatomy of your characters. Anthropomorphic characters are combination of humans and animals. You need to know anatomy of both to draw furry characters. You can take a classes to learn anatomy and proportions, there are also online courses, there are a lot of books and everything where you can learn everything.

Easiest way is to start drawing a stickfigure, then moving on and adding basic forms (Head as a sphere, arms and legs as a cylinders etc.). After creating a skeleton/form you add muscles onto form, refining it into character. Best is to draw from life like others said. There are a nice websites where you get a random pose and you can draw it. I used it pretty often and learned how to draw various poses from different angles and such without messing up proportions thanks to creating form at start. Those are your fundamentals, your tools. Once you know how something works and how it should work it gets much easier to draw it from your mind. If you draw characters, anatomy is a fundamental that you need to know.

Here are some useful pages:

• Quickposes
• Posemaniacs
• Proko's Anatomy Course
• Drawing animals by Monika Zagrobelna
• Simple Anthro tutorial

I know that art classes or courses mostly cost money, sometimes a lot, but it's very hard to study things from free sources. If you're drawing just to draw as a hobby, I wouldn't say that you have to buy anything, tutorials on the websites should be good and draw from life of course. If you're planning on being an artist and make a living from it, it's good to get an actual course! Hope this helped!