Asha was a bit off colour at the weekend, she vomited a couple of times, and had diarrhoea. We noticed that male dogs, even our neutered boy were very keen on sniffing her even though she'd finished her season 10+ days previously. Today she's worse. She didn't want breakfast, had been sick again, and was very lethargic, quiet and her poo still very loose and indoors, which she doesn't do. I wiped her vulva with a tissue, and there is a dry looking rusty coloured staining. It's not a wet discharge, just looks a bit like dried blood. She has had a bath since her season, so it's not leftover residue. Also her vulva is still swollen but that's probably normal. This season she has been a nightmare - she has flirted outrageously with my neuter boy, and it went on for ages. She was almost nympho! I took her to the vet, he's not convinced it's pyo, but he is going to treat as if it is, she had an antibiotic injection and tablets to start tomorrow. If she's any worse in the morning she has to go in and be put on a drip, have a scan etc. We want to avoid surgery if possible as she has a very bad heart (which is the only reason why she's not spayed). She doesn't have the excessive thirst, in fact is hardly eating or drinking. She is only 3, and it is very soon after the end of the season, only around 10 days. Does this sound like it could be pyometra? What else should I look out for? I've read the sticky, it seems like everyone has a slightly different experience so wonder what your thoughts are. Thanks.