Barry King makes great bevelers... You will need multiple width bevelers (essentially wanting a bevel face that is no longer than the line you will be beveling. For instance...the fur high on the back leg of your image, right below the tail would get completely destroyed, or the area around it, if you tried to use a 1/4" beveler for all of the beveling.
http://www.barrykingtools.com/groundersbevelers.htm
Look for "Beveler: Smooth" - it is the 5th row down and all the way on the right side. Based on your drawing, I would want at least 3 of these, 00, 2, and 4.
You can find an inexpensive swivel knife at Tandy, but found the Barry King one is much smoother to operate. That is all you would need to achieve what you listed. The list grows from there, of course. Hope this helps.