My OH's parents have two jack russel cross dogs, one of them, Max, can tell if someone is pregnant before we know! My sister in law told me that max never sat with her at all, and about a week before they found out she was pregant max sat behind her on the chair for ages. Then about 6 weeks ago the same happened to me, max never sits with me, but he came and sat on the chair behind me and cuddle me for ages, 2 weeks later we found out i was pregnant. He hasn't sat with me or my sister in law since tho! xx