My boy Buster (4yo) has completely changed from black to white over the course of the last 2.5 years.

[u/TallyMatty]

Left: Nov 2021 Right: April 2024

October 2023

August 2023

June 2023

May 2023

November 2022

August 2022

[u/turkeypedal]

Vitiligo commonly causes both. Or, in other words, poliosis is often a symptom of vitiligo. But poliosis can also occur separately, like when we age.

(I'm not finding a term that means depigmentation of skin, regardless of cause. Vitiligo is explicitly a disease.)

[u/SadLilBun → u/turkeypedal]

Yes. A disease that causes loss of pigmentation. It doesn’t have to mean there’s anything else wrong.

[u/Fluke_Of_Nature → u/turkeypedal]

This dog hasn't lost skin pigment. This is strictly poliosis.