Question: Why does my dog like to play on the stairs?

So he's 8 years old and he walks down the first three with no problem.Yet at the last two, he stops on the second to last and tries to jump off. When he does that, he always falls. It's so funny but I'm worrying about him, he would fall on his chin and this may be bad for his bones cause an injury. The other two dogs don't do this at all. He doesn't even do this with the second flight of five steps. The second flight of stairs is not wooden, it's tiled. The first one is wooden. What is this behavior why does he do it?



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