Woke up this morning to see blood all over my sheets. I have no idea which dog it was, although it was mostly where Heidi usually sleep so am guessing it's her. But I went over her with a fine tooth comb (and the other 2 too) and found nothing. I thought maybe a UTI, but there doesn't seem to be any urine i.e. it's blood, not diluted, and she's not showing any other signs of one. Very disconcerting....anyone have any ideas? I also thought maybe her mouth, or possibly Ferk was coughing up blood, but again, no evidence of it. I'm stumped.