Frankly you don’t even need to use AM/PM for casual conversation… “I’ll see you at four” almost certainly doesn’t mean 4am unless it’s very clear from contextual information, same for verbally booking appointments
It’s just things like travel timings etc which are likely going to be written anyway where you actually need that clarification
Anything territorial with a social structure (wolves, horses & boars being great examples of successful domestications, otters and falcons for in-progress domestications and foxes and raccoons good candidates) are prime domestication material as the human can become the social leader and they won’t be as inclined to leave what is their pack’s territory
That said, it takes thousands of years to fully domesticate something, which is why “semi-domesticated” otters and falcons just sort of help out with hunting without being “friendly” enough to be predictable