People can judge the age/quality of a horse by looking at its mouth. If you were going to buy a horse, you would want to check there to make sure the horse has the qualities you think you’re paying for.
The idea is that, if someone is giving you a horse for free, it shouldn’t really matter what qualities that horse has (assuming you are interested in owning a horse at all). Trying to assess its value, particularly right in front of the giver, is kind of like getting a gift and asking “How much did this cost?”. It can come across as rude or ungrateful.
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