Can you spay a dog after its first heat?

Yes technically you can have your dog spayed while she is in heat, however it is better to wait until you dog is out of heat because there is an increased risk of complication. If you do spay your dog while she is in heat you need to make sure to keep her away from intact male dogs for 5 to 8 days after the surgery because while it is impossible for a dog to become pregnant after being spayed she will still be producing reproductive hormones and if a male dog attempts to mate her you risk the stitches being pulled. Your best be would be to discuss this with your vet and see what they recommend.