It does appear that various Vets have differing opinions on the best age/time to spay.

Personally, i am in the wait until 3 months after their 1st season camp, and i agree with some other 's that feel it is best to wait until they are more mature.
You may notice a change in temperament before your bitch comes into season i.e she may be moody, appear tired or not herself.

also her 'lady bits' the vulva area do swell beforehand. There is also a wide age range of when they have their first season, which could be approx. between 6 and 18 months. One of my girls was 11 mths old and my other was nearly 15 months old. So I wouldn't be constantly concerned about this as your girl may not have hers for quite a few months yet.

You will probably see little spots of blood on your floor, when she does start, and to confirm for yourself that it is from her, then just get some plain white kitchen roll and place it on her area for a few seconds to double check.
I would just like to add i have been reading a very interesting post on another reputable dog forum and there is advice about Pyometra. It does mention that it is still possible for a spayed bitch to have Pyometra.
