Horse Animset Pro includes a huge amount of animations.
Update 3
Added Rider Combat Animations
Added Cloth to the Mane and Tail
Added Pegasus Wings and Animations
Added Horns for Unicorns
3rd Party Riding Systems:
Fast Riding System Plugin (Multiplayer)
Ascent Combat Framework
Riding System by ChDT
Advanced Riding Locomotion System
Technical Details
Features:
Includes Poly Art Version and Realistic with one LOD1
Armour, Saddle Reins, and Carriage/Cart/Wagons Reins.
Rider Animations for Each Horse Animation. (Rider’s Root Bone placed on Pelvis Bone Position)
Scaled to Epic Skeleton: Rider: Yes Horse: No
Rigged: Yes
Rigged to Epic Skeleton: Rider: Yes Horse: No
Animated: Yes
Number of characters: 3 Horse, Poly Art Horse, UE Mannequin
Vertex counts of characters:
Poly Art Horse: 2,439
Realistic Horse(Mane/Tail): 13,783
Realistic Horse No Mane/Tail: 9,304
Texture Resolutions: 4K Realistic, 128×128 Poly Art
Number of Animations: 221 Animation Clips
Animation Types: Root Motion & In-place
Original_Link: https://www.unrealengine.com/marketplace/en-US/product/horse-animset