NASA/USAF put (whole) dogs in a vacuum: https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19660005052.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.

NASA/USAF put (whole) dogs in a vacuum: https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/19660005052.pdf https://ntrs.nasa.gov/archive/nasa/casi.ntrs.nasa.gov/196600... The paper is pretty short read. They reference another study that was conducted with primates, but I'm not able to find it at this moment. Here's the part about primates: "After decompression to approximately 1 mm. Hg absolute, the squirrel monkeys appeared to lose consciousness sooner than the dogs. As with dogs, they had both tonic and clonic seizures shortly after unconsciousness and this progressed to flaccid paralysis. Subcutaneous emphysema and swelling occurred, but was not as marked. During and following recompression to ground level, the monkeys recovered similarly but seemed to exhibit staggering and disorientation for a longer period. Two monkeys died as a result of these low pressure exposures, while no dogs died from exposures that were less than 120 seconds. [...]" It's under "Observations made on small primates" on page 7.