The Bug
Originally the top of cows legs looked like this.

Besides one leg, that had a harsh white border like this

NOW with this new cow update, the white patterns received gradients to ease them into the dark fur better, and the legs were mirrored so the patterns didn't look so repeated.

However, because of this change, this harsh white border now appears on more of the legs. And it seems its texture was never given a softer gradient, and so the cut off remains harsh despite being more frequent.

I feel this is most assuredly an unintentional and overlooked quirk of the new texture, as the Warm and Cold cows have nothing resembling this.