Goldie was an Earth dog, deceased by 2152.

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 both Goldie and/or Duffy were Jonathan Archer's previous dogs, as he said that he couldn't remember not having a dog, and that he'd gotten Porthos only a couple years prior.
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