My Daisy was about 3 lbs when she was spayed. I would get your dog spayed now, as your vet suggests, and make sure they do pre-anesthetic blood work, that your dog is monitored during the procedure, and that the vet uses the safest anesthesia. There is a sticky in health and diet forum about the anesthetic drugs. My vet uses isoflurane which is very safe, even in small breeds.
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