Do Bernese Mountain Dogs only come in black tan and white?

Yes, Bernese Mountain Dogs are only supposed to come in black, tan, and white.

This specific tri-color combination is actually a breed standard. Any Bernese Mountain Dog that doesn't have this coloring is considered to be outside of the breed standard.

However, it's worth noting that there have been rare cases of Bernese Mountain Dogs with slightly different color variations, such as a brindle pattern or a reddish tint to the coat. These are considered genetic anomalies and are not typical of the breed.