Pardon me for intruding. I'm not too good with words.
This question makes me think somewhat on a tangent to the question "how can you tell a person has grey hair?" Do you start to count how many hairs a person has and divide a fraction? How accurate would that math formula be? Technology already allows us to have replacement for things like limbs and internal organs. When that happens, it is like a percentage of your human body taken away.
cyklone also makes a very good point above me. But maybe "person" is not the exact word. Is "soul" or "spirit" better? Because in the example of your dog, he/she does not interact with humans the way 2 humans interact with each other. And usually "person" is used to signify "human", whereas "soul" or "spirit" seems to be more liberally used.
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