This is a Skywalker Sound sound effect. It was created by Gary Rydstrom, and it debuted in The Lost World: Jurassic Park. Due to this being such a simple animal sound, it's very likely that one of Rydstrom's dogs was the one who made the sound.
Links:
https://soundeffects.fandom.com/wiki/SKYWALKER,_DOG_-_SMALL_WHIMPER#Audio_Samples
SKYWALKER, DOG - SMALL WHIMPER has been suggested to play 1 roles. Click below to see other actors suggested for each role, and vote for who you think would play the role best.
