Booking Limits

Wondering if there is a way to add pet limits vs booking limits to certain categories. Example: For overnight pet boarding I have it limited to 6, but I actually need it for 6 pets. Meaning if someone books one booking for 2 dogs that it takes 2 spaces not 1. Does that make sense?

This makes sense for boarding and day care bookings. Not sure how difficult it would be on the back end?