When adopting a dog (or any animal), what counts as "kids?"

When it says "not good with kids," is that under the age of 18? 13? 10? Just able to display maturity?

submitted by /u/_Marilyn_The_Witch_
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from Pets https://www.reddit.com/r/Pets/comments/nq8587/when_adopting_a_dog_or_any_animal_what_counts_as/