Gordon, was Tommy Jarvis's golden retriever. In Friday The 13th Part 4: The Final Chapter Gordon was last seen jumping out a 2nd story window on crystal lake, trying to get away from Jason Voorhees.
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Gordon playing with Tommy Jarvis in 1984
It's believed Gordon bailed on the family to either save his own life, or he possibly was so scared and had no other option but to jump. Due to Jason being under the staircase at the time, it means he had not attacked Gordon at all.
In the Friday the 13th game, it was confirmed that Gordon was later found alive by authorities and given back to the Jarvis family.