This blanket is called the "Curve of Pursuit" and was designed by Pat Ashforth and Steve Plummer of Woolly Thoughts:
Mine was made in the colours of one of my favourite dogs and was gifted to her humans.
"The design is based on the curves that are formed if four dogs set off to chase each other from the corners of a field. The path created by each dog is an equi-angular spiral."
I am very happy with how this turned out and proud of my persistence. It looked kind of funny in the beginning and I almost gave up. I'm so glad I didn't; even if it did mean I spent much of July with a wool blanket across my lap.
If you're on Ravelry, you can check out the details, here.