Murphy: Dog or Squirrel

Lately, acorns are starting to fall off the trees. I did not really start noticing this until Murphy pointed it out. Murphy was not only interested in playing and rolling the acorns around with his nose, but he even tasted one. After one taste, he went back in for some more. After that, I had to keep a close eye to make sure he did not sneak anymore and get sick. What a funny pup! So the question asked: Is Murphy part squirrel?