What age is best for spaying?

[doubletall]

Our lab pup is 6 months old which is the age our vet recommended for spaying.  However, I've read opinions that it’s better to wait until they are around a year old and have done most of their growing.  I'd prefer to not deal with a dog in heat but if there are health benefits to waiting that's what we'll do.

Anyone have a strong opinion one way or the other?

Thanks,

Dave

[KFhunter]

do it now 

[WAcoyotehunter]

absolutely wait until after their first heat.  Give them a year or so to mature.

[Old Dog]

Read this before you do anything.   
http://www.caninesports.com/uploads/1/5/3/1/15319800/corpulent_canines_for_website_2012.pdf

[Forks]

Let your dog develop. A vet will always say chop early.