While playing Minecraft, when you tame a wolf and exit the game, the dog's fur changes as the necklace color.

I was playing Minecraft with one of my friends, when they tamed a wolf, it was alright... When they left, I left the game too. I came back to the world and the dog's fur was red, (Which was the color of the dog's necklace) This has been happening a lot, so I decided to come here and report it. I left a screenshot to show how the wolf looks like.