Sudden death of my male lesser

Their substrate is newspaper so it definitely wasn't that. I just wonder what could have been wrong with the mouse. It was frozen and from a reputable breeder and it was thawed out and warm when I gave it to him

I highly highly doubt it had anything to do with the mouse.

In my emergency clinic we see the kind of fluid from respiratory orifices in cats and dogs with congestive heart failure. Usually by the time they get to the stage where there's enough fluid in the lungs (pulmonary edema) for it to come out the nose the animal is end stage. Because animals can live a fairly normal life with CHF until it gets really bad a lot of owners don't even kknow there was a problem until its too late. I'm not at all saying that's definitely what happened to your guy, but just an idea.

Thank you everyone for your speculations. I should have had a necropsy done, and now I actually really do regret it because there's a lot of possibilities. But it's nice to hear different opinions

skirtinthedirt - My dog had cardiovascular effusion that also caused fluid in his chest cavity to build up. It happened very suddenly but I guess had been lying dormant for a long time. With every test known to man it was concluded to be ideopathic ("we don't know"). I had to put him down 1 week after first bringing him to the vet (last april). What I feel scared of is 6 months later our other dog was put down for the exact same thing. I know I most likely don't actually have anything to worry about....I just worry especially with all the deaths in the last year and I know they probably aren't related but its still scary

I hope it wasnt crypto...that is very contagious!! It can wipe out whole collections!

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Were your dogs related? Or the same breed? Pericardial effusion (what I think you are talking about) is fluid that builds up between the heart and the sac (pericardium) that covers the heart. This makes it difficult for the heart to beat appropriately and the fluid can leak out and fill up the chest cavity as well. A lot of things can cause pericardial effusion, including tumors that have metastasized to the heart. That means that, if it's any comfort, your dogs may have had the same symptom that caused their death but the root cause could have been completely different. Pericardial effusion is a fairly common cause of death for older dogs (often causing rapid or sudden death), so the idea that something in your house is causing this, while understandable, is not something I would worry about.

I'm sorry for your loss, and lack of closure. What a bummer.

The dogs were not related, one was 7 years old (2 weeks from 8 years old) and the other was 9 years old. and yes it was pericardial effusion that was my bad. My first dog they pulled the fluid from the chest...nothing abnormal it was just inflammation cells. They did bloodwork, lots of xrays, ultrasounds. He was going into right side heart failure. They pulled all the fluid from his chest and as much as they could from the sac around his heart. They pulled about a liter total. Within a week it was even worse and I chose to put him down because whatever was causing it was too aggressive and they had no clue what it was. You know, maybe one of these days I'll post his xrays and results. I originally brought him to the vet because I thought he was constipated. They took an xray, the top view showing every single one of his organs was on one side of his body, the spine splitting down the middle and the other side completely empty. It was insane and the most heartbreaking thing I've ever gone through! Our second dog got diagnosed with pericardial effusion 6 months later and we decided not to make her suffer through those tests...everything was just awful =(