Is it abuse to force a dog to ride a paddle board?

I went paddle boarding on a lake with my brother, and his girlfriend last weekend, and my brother brings his shih tzu with them when they paddle board. So my brother put his board in the water then put his dog on the board. Then my brother got on. The board flew out from under my brother and his dog flew off. The dog stayed on his board for the whole 5 hrs we were out there, and seemed pretty relaxed, but im not sure it wanted to be out there, and I thought it was kind of cruel.

Is it abuse to force a dog to ride a paddle board?
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