It's so cozy! Even though it's slightly more expensive, I recommend using Soft N Comfy fabric rather than fleece. Get the kind that's soft on BOTH sides. It really makes all the difference when touching and feeling this blanket. Right now it's on sale at JoAnn's until December 24th!
Before you print out and cut these patterns. I would recommend not printing the tail pattern and just printing the fins. The tail pattern can be easily done without the pattern. Of course, if you feel more comfortable using the pattern and don't mind printing and taping all the pieces together then by all means, that's what it's there for;-)
Here are the files for a younger child 1-5.
Here are the files for an older child 5-10.