What's the name of Doc Brown's second dog in Back to the Future?

Is it just me, or does 1955 Doctor Emmett Lathrop Brown — aka Doc — look pretty much exactly the same as his 1985 self? I’m not sure if he aged way too young or is actually aging amazingly well.

Regardless, Doc Brown wouldn’t be the same if Christopher Lloyd hadn’t come in and made him one of the great movie characters. In 2008, Empire magazine ranked him as the 20th best movie character ever. 

Besides being an underappreciated genius and spacetime continuum repairman, he apparently is also a dog person. In the first "Back to the Future," we see Doc with a dog in both 1955 and 1985. But in 1985, the little guy got a little more screen time. What’s the name of Doc Brown’s dog in 1985?

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