Here's a retexture pack involving several texture options to choose in each creature.

CONTENT:
-- Slighty improved basic texture and 1 new variant for bay horse (buckskin)
-- Slighty improved basic texture and 1 new variant for chestnut horse (flaxen)
-- Slighty improved and less purple basic texture and for black horse
-- Slighty improved basic texture and 4 new variants for dog (dark grey, brown, white, husky)
-- Slighty improved basic texture and 2 new variants for grey horse (white, dappled)
-- Slighty improved basic texture and 2 new variants for minotaur (black, brown)
-- Slighty improved basic texture and 2 new variants for minotaur lord (painted, white)
-- Slighty improved basic texture and 3 new variants for mountain lion (snow leopard, potted, spriped)
-- Slighty improved basic texture and 2 new variants for paint horse (black, lighter brown)
-- Slighty improved basic texture and 4 new variants for rat (black, hooded, grey, albino)
-- 2 new variants for trolls (skyrim-like and alternate)
-- 3 new variants for bay horse (blue[new], purple, yellow)
-- Slighty improved basic texture and 4 new variants for wolf (black, white, dark grey, brown)

INSTALLATION:
Choose the variant you want and copy&merge in Oblivion>Data folder. Replace the existing files if there are any.

OTHER NOTES:
* I allow them to be used as resources for another mods. However some credits would be appreciated.
* Those are replacers
* Grey horse texture also affects Unicorn
* Black horse texture also affects Shadowmere (that's why I didn't want to make any more variants for black horses)
* Yes, striped and spotted variant of Mauntain lion has faded markings. I didn't want to completely turn them into tigers/leopards.
* I do not make requests