hi guys, i really need some help. i have K for 2 months and adopt M for 8 days. both are kittens.

the first day looks ok. second day both play & chase each other. looks ok

but on 3rd day, K always bite M's neck & ear. M will hissing but no growling & later will find place to hide.

K is a bit rough. she just want to play.

why is they ok on 2nd day but the next day both completely different? can both of them reconcile and play together?

jz be patient, it will take time.  ez for cats less than 1y to get along.

hv u seen cat shelters,  boarding places tht dont cage cats.

all can share places just fine.

need to observe ' bullying ' tho.

I'm one of those who are totally against cutting a cat's whiskers. It had your desired effect because cutting their whiskers makes them disoriented.

AFAIK, introducing a new cat requires time and patience. What some people do is they isolate the new cat away from the existing ones and then slowly introduce the new cat's scent to them. I heard people say it could take a month or more before they can get along, and in some cases they cannot get along at all, in which case you might need to consider giving up the new kitten.