According to the American Humane Society, as early as six weeks of age. It might be worth mentioning that the procedure becomes more involved and potentially more expensive as the dog gets older.
Source(s):
http://www.americanhumane.org/protecting-animals/adoption-pet-care/care/spa...

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It's best to have the procedure done while they are still puppies. Some may suggest that you let them have a litter first but I've heard two different stories regarding this from vets. Typically, it costs less and recovery is much quicker the younger the dog. Check up with the vet, if you don't have a regular one then I would call around and do some q@a. Some charge based on the pets weight. However, both of my dogs had the procedure before becoming full grown. If the dog is indoors, make sure to have it done before they are "in heat". Otherwise, invest in some doggy diapers. I hope all goes well and don't take your pet to a vet just because he/she is cheap. My friend had a bad experience and the vet would not give her dog pain meds, sounds silly but yes they can have pain medication. Wishing you and your pet the best of luck!
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I've usually seen people wait until about eight months of age. Do it as soon as you think your dog is ready, though, because you don't want any surprises.
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My vet has always recommended six months of age. Remember that when the animal is fixed, it has an impact on what their final grown size will be. Too early and their size may be reduced.
Source(s):
http://www.canismajor.com/dog/spayneut.html

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I think we had ours done at 4 months old. I would just go with your vets recommendation.
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