Whatever type, they ALL have construction. This construction is going to be valuable in posing your character and adding attitude.
Creating creatures is easier if you start with big basic shapes first.
Begin with these and then combine 2 of them for head and body or modify one of them by cutting into the big shape with smaller shapes. Just remember to keep it simple.
Examples by Melissa Van Der Paardt, Nico Martet
If you're having trouble coming up with designs, combine animals, maybe 2-3, but, make only one animal element dominant.
Remember those simple forms? The concept of flow directions, like the human abstraction forms can be used for critter design as well.
Examples of great shape design by various artist. The best way to learn how these character designers did such great designs is to deconstruct their forms. What's the simplest forms they started with, how did they break these up, etc?