I would suspect rabies.
First of all, my experience with packs of coyotes in NH is that they are NOCTURNAL PACK hunters.
Meaning, if you let Fluffy the cat(or small dog) out at 11pm to pee before bed, it is quite possible they will be surrounded and killed by a pack of coyotes.
This also happens here with Fishers(also known as Fisher Cats). A member of the weasel family.
Coyotes that are out in the daytime hours are usually sick.
Attacking a child is also not normal behavior. This would be normal behavior for a Mountain Lion. Not for a coyote or even a Coy dog.
All of the Eastern Coyotes have dog DNA/breeding mixed in now. They are much larger than the Western Coyote.
"Normal behavior" in areas where coyotes are not protected, because being out in daylight makes them vulnerable to being shot.
In areas where coyotes are protected, it is much more common to see them during daylight.
Coyotes are very adaptable, and adapt to the circumstances.
“Fluffy the cat(or small dog)”
They will attack larger dogs but not near houses (men with guns). One coyote will run limping and whining close enough to entice chase. Once away far enough away, the pack will attack.
I live in N Nevada high desert.
We have coyotes all hours of the day.
ONLY reason to have a .22 up here is due to the coyotes bothering livestock.