Sound Ideas, ANIMAL, BULL - ROARING AND SNORTING, PROCESSED

This sound effect can be found on the Wild World of Animals Sound Effects Library, which was made by Sound Ideas. Some of the roars feature a low pitched version of CAMEL - VOCALIZATIONS, ANIMAL and BEAR - BLACK BEAR: MULTIPLE ROARS AND BREATHS, ANIMAL. Despite being labelled as a bull sound, it's actually a combination of bear roars mixed with camel groans and horse snorts. The original, unedited and extended bear versions were probably recorded by Jeff Hutchins, and are probably available in a different sound library as well.

Clean, Full Length and Unedited Link to the Sound Effect

Bizaardvark (Heard often in "First!"; used for a ram.)
Spongebob SquarePants (One of the unedited, original bear versions was used for the sea bear in The Camping Episode, the horse/ungulate snorts are used for the Sea Rhino as well.)
The Emperor's New School (Shortened for Yzma when she briefly turns into a Dragon, albeit slightly low pitched in the episode: Yzma Be Gone)
Lilo & Stitch: The Series (Original, Unedited, Extended bear versions were used for the transformed Mammoth when it trumpets in the episode "Retro", it's mixed along with Hollywoodedge, Elephant Trumpeting PE024801 .)
Class of the Titans
Dinosaur Planet
Dinosaur Revolution
Fatal Attractions
Human Prey
My Little Pony: Friendship is Magic
The Oblongs (Heard once in "My Name Is Robbie".)
Shaun the Sheep (Heard once in "The Stand Off" and "You Missed a Bit".)
Walking with Beasts
Walking with Cavemen (US version only.)
Walking with Monsters
When Dinosaurs Roamed America

Ferdinand (2017)
King Kong (2005) (Used for the Ferrucutus. Only heard in the deleted scene.)
Brother Bear (2003) (Original, extended, unedited bear version used for Koda's mom and for the other bears)
Balto 2: Wolf Quest (2002) (Original, extended, unedited bear version used for the Spirit Bear)
Balto (1995) (Original, extended bear version used briefly, albeit faintly heard sometimes for the grizzly during the attack scene)
Leo the Lion: King of the Jungle (Video 1994) (Original extended bear version used for the titular lion character Leo, specifically when he roared at the hunters for trapping Tooey. One time, used for Tooey's mother, when she's free. Albeit the roars are low pitched, like the variants in Man's best friend.)
Man's best Friend (1993) (Possible Debut, Original extended bear version used for the caged up Black Bear, albeit low pitched)
Night at the Museum (2006) (Used once for a rhino chasing a pair of zebras.)
Puss in Boots (2011)
The Great Outdoors (1988) (The original, extended bear versions are used for black bears, low pitched, could be similar sounds as well, another plausible debut.)
The Secret Life of Pets 2 (2019) (Heard when the brown bulls snort at Rooster after stop him)
The Book of Life (2014)
The Wild (2006) (Used for the wildebeest, including Kazar)

The Boulder Theory Film
Dane Pavitt/Fossil Fix (Heard in "MARCHING DINOSAURS | Animated Size Comparison" when a Ceratosaurus and Tuojiangosaurus appears.)
Nicholas Dodge Animations (Used for the Arsinoitherium and Styracosaurus.)
SML Videos (Heard in "Bowser Junior Gets His Nose Pierced".)