yes. it is.
Howrse no longer does codes.
You do not need a code to register a horse on howrse. You make an account.
There are currently no available promotional codes for Howrse.
no
There is no code. The fox hat code is a rumor.
The url for the international howrse is linked below and you can reach the others from the site.
There is no Santa Hat code in RuneScape.
no
there are none
there is a code for a founder hat the code is founder10178 :)
Ask nicely
there isn't one