If she is still teething, biting is kind of second nature and teaching her now not to bite you is pretty important as those teeth are pretty sharp while dogs are still quite young. If the spray works, use it by all means. Sometimes screaming out when they bite will stop them. When I got Tibbe at 9 mos., he was all done teething so I think she will be done before 9 mos. of so, unless she has developed the biting from bad habit. Be sure she has some toys and Nylabones, etc., to chew on to satisfy that chew instinct. Good luck with your training this weekend! Let us know how you did and have a great weekend.