Well, I found another wild cow, lured it with clover, tied it up, and boarded the ship, then made the travel to the home docks. The cow was similarly stuck in the water near the docks and I couldn't get her on the raft. When i try to take a cow on a raft, no matter whether it is tied or untied, I see a notification: "This can not be transported using the raft"
P.S.: The cow walks on the water, but cannot go beyond the limits of one cell (or several cells) on which it stands.
