Grey Buffalo in dreams
A heavy, horned herd animal — collective force that protects its young by closing ranks.
How grey changes the reading
Grey colour layers ambiguity onto the symbol. The base meaning is still there, but the dream is saying you do not yet have the colour information — the situation has not declared itself.
The base reading of Buffalo
A buffalo in a dream is the dream's image of the group that becomes a single defensive body. Buffalo herds turn outward, horns to the predator, calves in the middle; the dream uses them when a family, a team, or a community is being asked to form that ring. A buffalo herd standing close is the dream marking the protective instinct doing its job. A solitary buffalo separated from the herd is the dream noting that someone — possibly you — has been pushed to the edge and the group has not noticed yet.