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Why did my dog die suddenly without symptoms?

My dog was lethargic yesterday. Didn't want her usual biscuit, or to go outside. She laid around, but didn't whine or anything. We thought she wasn't feeling well, but nothing serious. This morning when we woke up her eyes were open, her tongue was hanging out and she was dead. She began losing fluids from her body shortly after. No vomiting or blood. She had just received a clean bill of health from the vet 10 days ago. She had one fatty tumor on her side that was found to be benign. We just lost another pet 3 months ago to potential stomach cancer, she just wasted away and couldn't keep anything down. She was also about 7 years old. Any idea what may have caused the sudden death, with hardly any symptoms?
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Avatar universal
I had a toy schnauzer that was 9 lbs 1 yr.old die from taking tribrisson.She did not have systemic shunt. She was very healthy never sick until she was around a dog a neighbor had that had a runny nose. The Vet prescribed the tribrisson. The Vet did all kinds of tests but couldn't save her. The meds affected her liver. I know this is suppose to be rare but found out some other Schnauzers have been affected by this drug too.
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234713 tn?1283526659
MEDICAL PROFESSIONAL
I am so sorry about your sad loss!

Your dog could have appeared normal in an exam when she went to the vet on Jan 19, but there may have been some abnormality that would only show up with more involved diagnostic procedures, such as blood work, ultrasound, etc.  Some abnormalities could be microscopic, such as some forms of cancer,  and would not even have shown up on X-Rays, Blood work, ultrasound,  MRI, or other diagnostics.

Other cause of sudden death may include: toxin ingestion, internal wounds from trauma, electric burns, bleeding disorders, lightening strike, gastrointestinal torsion, lung torsion, heart worm disease, heart failure, splenic tumor that bursts, Lyme nephropathy and many many more can also cause sudden death.  Only toxicology screens, blood work, a post-mortem exam and other diagnostics may be able to determine the cause of death.
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