we have a 7 month old blue nose and a 4 year old male. this is our first time having 2 dogs and i need some info on the whole going in heat- how old should they before you need to be prepared? what do you look for? i've heard different ages but my male has been acting peculiar with her. i know we can't let him do anything for quite a while, so i need to know if she's old enough to go in heat or if we have a little time? any help with this would be appreciated.