Sick Possible pregnant Jack Russell

Question
My jack's mated about 3 weeks ago and I think my female is pregnant. Two days ago she stopped eating and yesterday started spotting blood (not a lot). She's no longer active and tonight vomitted some. Is she having a miscarriage?

Answer
Hi. It's hard to say for sure what's going on with her, but my best advice here would be to get her to the vet to find out what's going on. Dogs do experience what's call pyrometra, a serious life threatening infection of the uterus. Most dogs who experience this show signs at about 3-4 weeks after heat. Even though it's much more common in larger dogs than yours, I would still get her to the vet just in case. Good luck.