Sometimes the mother nature places her weird quirks on to her children... 

Albinism Blind/Mute/Deaf | Cherub | Chimera (Coming soon!)
Double tail | Erythrism  | Frail | Hanahaki | Hermes | Horns | MelanismMismatch  

There is a possibility your centaur is born carrying two color-altering mutations. 
In that case, the centaurs owner can choose which mutation is visible, and which one carried and not shown.

Sagittari doesn't have separate inbreeding only mutations.
All mutations present can appear with or without inbreeding.