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Hi. My name is***** I'm very sorry to hear about your loss of Daisy. This is a very sad situation. When a dog is coughing up blood, I get really concerned for underlying heart disease, electrocution injuries, trauma / contusions, and coagulation issues. If her clotting times were normal, then it would seem that a coagulopathy would not be present. Did they hear any murmurs or did she have a history of a heart murmur? Was she one to chew on things?
Sorry for my delay. IF she had no heart murmurs in the past, then that is would seem to make heart issues more unlikely. But not totally impossible. I've seen two dogs in my career go into fulminant heart failure and look just like this because they tore a valve in their heart. So this is a possibility here. When they are coughing up blood, the situation is very, very, very bad. Honestly, when a dog is coughing up blood, that is just a fraction of the blood that is in the lungs. The overall lung function is very critically compromised and when this happens, almost all are going to be lost unless they can be ventilated for. This is something that not very many clinics have available.
The reason the blood started to be coughed up in the oxygen cage is not because of anything they did. IT is because the underlying problem was progressing. The lungs were filling with a hemorrhagic fluid and it finally was enough to physically be brought up.
The underlying problem is what caused the hemorrhagic fluid in the lungs. Was this due to a heart valve tearing? Was it due to an electrocution injury? I've seen similar cases when dogs chew on electrical cords and get shocked and they get this fluid in the lungs.
You have the house in a condition that makes that electrocution injury basically a non-issue. Your husband is correct in that looking for a burn / lesion on the lips, tongue, or check could further indicate that. I've seen some though that have no oral lesions that can be found. If there wasn't a coagulation issue, no electrocution injury, no trauma / contusions, then a tearing of a chordae tendinae with one of the valves may just be the underlying cause. I remember my first one so clearly as it was a greyhound that presented acutely with increased respiratory effort that progressed quickly to fulminant pulmonary edema with frothy blood tinged fluid. It was an eye opener in my early career about how quickly a body can be compromised and pass when that serious of an injury happens.
Pneumonia typically doesn't have this quick of a progression and bloody fluid being coughed up. Could there have been a situation where a very odd situation like a lung tumor ruptured and started to bleed into the lungs?
One of the things you could request is to have the x-rays reviewed / sent to a boarded veterinary radiologist to see what their interpretation of the films are. I will say this, some veterinarians are better than others. That is just the nature of it. Just the other day, my wife's cousins's puppy was handled in a manner by two veterinarians prior to myself being involved that I was a tad (that is phrasing it very nicely) frustrated with.
To get a specific answer at this time as to the passing may be something that isn't possible. If you want to get more answers, I don't know if doing a necropsy is something that can still be done. The case I was referencing early in my career had the torn cordae diagnosed at necropsy as nothing before it had given that answer. Our puppy is doing well at this time, thank you for your concern. I wish I could do something else for your little one. I hate to say it like this, but sometimes some conditions are so severe that nothing in our power can reverse / treat the situation. I've had numerous cases in my career where all my knowledge, skill and care didn't save the patient as the underlying disease / injury was just too severe.
I'm glad you have that sounding board of a friend to run things by and to have them check things over. They are going to be the best at this time as far as helping you to determine where and what the next step is. I can't say why and what reasoning things were done as they were. I absolutely understand that heart break at this time of not having Daisy with you. My deepest condolences go out to you and your husband.