Are they really dog lover or just keeping the dog for fun?

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I wanna share this true sad story that I saw in China, once I was at a beach in China, I saw this chinese family(father and 2 sons) they took 2 little dogs and went to the jetty and threw them into the water, and when they went back to the beach and waited, one of the little dog is back to the shore, they happily took the little dog and walked away, I stopped them and asked how about the other little dog that they threw into the water? They said the other was not as good looking like this dog they are holding, so they dont want it anymore. I was really sad when I heard this, and they went home happily in their motorcycle. I turned around and didnt see the dog in the sea anymore, kinda sad.