I am confused too. Could you please give context as required by the forum guidelines. What cat and why is the verb in the simple present? Why 'boards' instead of 'gets on'? Why not ' that' instead of 'which' or 'who'?
Do you want to personify the cat? Use who. Otherwise use which.So maybe you can tell me what is better to use in a sentence like this:
I have a cat who/which hates sleeping in my bed with me.
Which of these would you use in the sentence.