
It seems Snake spousal marks are unique- with info yet to be revealed, but generally they are given if a female accepts a male and h loves her - they can be abandoned by being cut- but with the special snake ones if she still has feelings for him they won't dissapear. It also seems they can only appear if feelings are involved and a male can only give one mark his entire lifetime while a female can receive many. What are you confused about?

I think not, also Curtis bit her at some point while hugging her which might be when he gave her the mark- perhaps only ferals can do this- It has not been shown why, but possibly the pack animals need permission from the female to place the mark and perhaps mate with them first or something? This is still a secret to the readers. Might find out later.
Can Some one Explained How Do the spousal marks work? ╮( ̄▽ ̄)╭