When breeding make sure they are in water and for imprint, the ones I raised was always a walk. It only shows it wants care. It doesn’t show what it wants, so I whistled follow and it got a 25% imprint as soon as I did. Each time I just took it for a walk.
Amazing for starting out if you wanna go in the ocean and you don't have scuba gear unlocked, they are extremely fast and can outrun pretty much anything in the water like the dolphin, I still use mine even now