Can An 8 Month Old Dog Get Pregnant/?

Yes, if she has gone into its first heat cycle.  If your dog is in heat keep her away from male dogs and do not leave her unattended in the back yard.  If you are not planning to breed her now is a good time to get her spayed.  If you spay a dog before the first heat cycle this reduces the chance of mammary cancer to almost zero.

Yes she can. Pups will go on heat around about when they are 6 months old so they could possibly get pregnant then.