Sneaky Smeagol said:

For practice (just practice not as something to actually sell or use) try taking some free stock wolves off the internet and tracing them over and over to get a feel for anatomy. Try to separate the body and head into shapes and study all the different parts. Try drawing a skeleton, a wolf from different angles, a super buff wolf, a long haired or short haired wolf etc. Try drawing skinny and fat wolves, tall and short, mess with different sizes and styles finding what suits you.
Lots of people don't actually draw realism, but your cartoony/chibi styles will be improved once you understand the realistic, proportional way! I learned from just drawing over and over and over again.

Look at little details, like the way a wolfs nose looks or the shape of its eye and direction of fur. Look up tons of tutorials! For fur, don't make anything all the same direction and length. Fur can follow a general direction, but it shapes around the body and will go off in different directions and lengths. Try practicing drawing short vs long and thick vs thin hair.
For paws, definitely look at real images, if you have a dog check theirs out! My dogs are super tolerant and let me play with their toes so I just practice drawing their feet from different angles and positions. The paw will flatten against the ground and looks different depending on wether it's supporting weight or not. Look at other people's drawings too.

Space Man said:

I strongly suggest using reference images of real wolves; before actually drawing full on pieces, do sketches based on certain aspects of the reference image you chose. Once you get used to the anatomy, then you can move onto drawing polished pieces