Seems to be caused because some of the pixels on the overlay textures are transparent. But instead of mixing colour with the horse main texture, it mixes with blocks behind the horse.
MC-161845
Parts of horse texture is transparent
Resolved
Duplicate
0
Thank you for your report!
We're actually already tracking this issue in MC-161495, so I resolved and linked this ticket as a duplicate.
If you would like to add a vote and any extra information to the main ticket it would be appreciated.
If you haven't already, you might like to make use of the search feature in the future to see if the issue has already been reported.
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