could she be going into early labour?
Answer Yes. 51 days is not too early actually, as their gestation period average is 63 days, but can go into labor earlier. She might not actually have her first puppy for 24 hours or more, but the fluid discharge is a sign. The restlessness, heavy breathing/panting, etc., are signs. I hope you have a whelping box for her so she can go in it and feel comfortable, and “nest” in it. She will scrape the blankets or whatever you’ve put in it, and arrange it and rearrange it. She will stop eating, and possibly stop drinking. I’d get a baby electrolyte (a generic Pediloyte) for her to drink, a powdered canine replacement milk that you mix with water, she will drink that well, and a liquid diabetic glucose booster. Give her a squirt in the mouth every once in awhile when in labor to keep her blood sugar up. Vanilla (only vanilla) ice cream and smooth peanut butter is good too. Offer her a tad of ice cream while in labor, and put smooth peanut butter on your finger and let her lick it off, and