Call them first. Then take it from there.
I would.call them first. But you should be able to just send them a check with a note in memory of.... That's sweet of you.
Their website has a lot of information about donations. https://www.thinkingoutsidethecage.org/other-ways-to-give/
I over paid and donated like that. I'm not sure to be honest. Maybe call or stop by and ask. Their all good people up there, and someone will be able to help.
Thanks! Your answer is awaiting moderation.