Duffy (dog)

From Memory Alpha, the free Star Trek reference.

Duffy was an Earth dog that was born in 2132 and died 13 years later, in 2145.

In 2152, Captain Jonathan Archer had a dream in which Porthos had died, and was being buried in a pet cemetery. Duffy and Goldie were among the gravestones also in the cemetery. (ENT: "A Night in Sickbay")

Although not explicitly stated, it is probable that Duffy was Jonathan Archer's dog, as he said that he couldn't remember not having a dog, and that he'd gotten Porthos only a couple years prior.