When a wolf flows down a water stream, and if the water stream isn't abrupted by anything like signs etc. after the wolf flows down. A shaking off sound will play but their lighting will be darker than normal.

Steps to Reproduce

• Create a flowing water stream like the one I attached in the picture. Make sure it's a closed area.
• Get on top of the water stream and summon a tamed wolf using "/summon minecraft:wolf ~ ~ ~ {Owner:_PlayerName}"
• While the dog is flowing down make him sit. Unless, it will shake off the water when he goes down stream.
• Let him flow all the way until the water stream ends. Don't block off the water stream to end shortly using signs etc.
• When the wolf gets to the end of the water stream, he will play a shaking off sound but the animation won't play and he will still be wet and appear darker than usual.