I made two changes to what the pattern called for.
First, I used acrylic yarn. I refuse to use good yarn on a dog that's going to go out and roll in poop and GA red clay. Acrylic is so much more washer and dryer friendly.
Second, I used two size 6 circs. instead of the dpns called for. I seem to be allergic to the use of double pointed needles. yuck!