All Story Mode Horse Names - To change which horse my mod replaces 
copy the name of the horse you want to replace,
right click the .ymt > rename > paste (Ctrl+V)

a_c_horse_americanpaint_greyovero
a_c_horse_americanpaint_overo
a_c_horse_americanpaint_splashedwhite
a_c_horse_americanpaint_tobiano
a_c_horse_americanstandardbred_black
a_c_horse_americanstandardbred_buckskin
a_c_horse_americanstandardbred_lightbuckskin
a_c_horse_americanstandardbred_palominodapple
a_c_horse_americanstandardbred_silvertailbuckskin
a_c_horse_andalusian_darkbay
a_c_horse_andalusian_perlino
a_c_horse_andalusian_rosegray
a_c_horse_appaloosa_blacksnowflake
a_c_horse_appaloosa_blanket
a_c_horse_appaloosa_brownleopard
a_c_horse_appaloosa_fewspotted_pc
a_c_horse_appaloosa_leopard
a_c_horse_appaloosa_leopardblanket
a_c_horse_arabian_black
a_c_horse_arabian_grey
a_c_horse_arabian_redchestnut
a_c_horse_arabian_redchestnut_pc
a_c_horse_arabian_rosegreybay
a_c_horse_arabian_warpedbrindle_pc
a_c_horse_arabian_white
a_c_horse_ardennes_bayroan
a_c_horse_ardennes_irongreyroan
a_c_horse_ardennes_strawberryroan
a_c_horse_belgian_blondchestnut
a_c_horse_belgian_mealychestnut
a_c_horse_buell_warvets
a_c_horse_dutchwarmblood_chocolateroan
a_c_horse_dutchwarmblood_sealbrown
a_c_horse_dutchwarmblood_sootybuckskin
a_c_horse_eagleflies
a_c_horse_gang_bill
a_c_horse_gang_charles
a_c_horse_gang_charles_endlesssummer
a_c_horse_gang_dutch
a_c_horse_gang_hosea
a_c_horse_gang_javier
a_c_horse_gang_john
a_c_horse_gang_karen
a_c_horse_gang_kieran
a_c_horse_gang_lenny
a_c_horse_gang_micah
a_c_horse_gang_sadie
a_c_horse_gang_sadie_endlesssummer
a_c_horse_gang_sean
a_c_horse_gang_trelawney
a_c_horse_gang_uncle
a_c_horse_gang_uncle_endlesssummer
a_c_horse_hungarianhalfbred_darkdapplegrey
a_c_horse_hungarianhalfbred_flaxenchestnut
a_c_horse_hungarianhalfbred_liverchestnut
a_c_horse_hungarianhalfbred_piebaldtobiano
a_c_horse_john_endlesssummer
a_c_horse_kentuckysaddle_black
a_c_horse_kentuckysaddle_buttermilkbuckskin_pc
a_c_horse_kentuckysaddle_chestnutpinto
a_c_horse_kentuckysaddle_grey
a_c_horse_kentuckysaddle_silverbay
a_c_horse_missourifoxtrotter_amberchampagne
a_c_horse_missourifoxtrotter_sablechampagne
a_c_horse_missourifoxtrotter_silverdapplepinto
a_c_horse_morgan_bay
a_c_horse_morgan_bayroan
a_c_horse_morgan_flaxenchestnut
a_c_horse_morgan_liverchestnut_pc
a_c_horse_morgan_palomino
a_c_horse_murfreebrood_mange_01
a_c_horse_murfreebrood_mange_02
a_c_horse_murfreebrood_mange_03
a_c_horse_mustang_goldendun
a_c_horse_mustang_grullodun
a_c_horse_mustang_tigerstripedbay
a_c_horse_mustang_wildbay
a_c_horse_nokota_blueroan
a_c_horse_nokota_reversedappleroan
a_c_horse_nokota_whiteroan
a_c_horse_shire_darkbay
a_c_horse_shire_lightgrey
a_c_horse_shire_ravenblack
a_c_horse_suffolkpunch_redchestnut
a_c_horse_suffolkpunch_sorrel
a_c_horse_tennesseewalker_blackrabicano
a_c_horse_tennesseewalker_chestnut
a_c_horse_tennesseewalker_dapplebay
a_c_horse_tennesseewalker_flaxenroan
a_c_horse_tennesseewalker_goldpalomino_pc
a_c_horse_tennesseewalker_mahoganybay
a_c_horse_tennesseewalker_redroan
a_c_horse_thoroughbred_bloodbay
a_c_horse_thoroughbred_brindle
a_c_horse_thoroughbred_dapplegrey
a_c_horse_thoroughbred_reversedappleblack
a_c_horse_turkoman_darkbay
a_c_horse_turkoman_gold
a_c_horse_turkoman_silver