[saaaaaam]

I have a fantastic way that I’ve trained my CO2 sense: an Italian greyhound. Anything above 900ppm and he barks and gets quite frantic above 1100ppm. I’m now able to anticipate the barking and normally realise at about 850ppm that we need to go for a walk and open the windows.

A vet friend theorised that because they have a completely disproportionate and crazy cardiopulmonary system (huge lungs and heart compared to overall volume) they are particularly sensitive to CO2 because they inhale more of it and it goes into their blood and brain much faster.

As soon as we open a window he calms - in winter I don’t take him out, I just ventilate the room.

[bjoli]

On a related note: A friend of mine was exposed to high co2 levels while on a freight ship. He says it is the absolute worst feeling he has ever felt, with panic and convulsions and vomiting. He survived because a colleague of his managed to get him out.

Kinda makes me wonder why it is still allowed in animal slaughter. It is cheap and gets the job done, but there must be better gasses. There are loads that just makes humans pass out, and it must be the same for animals.

[dredmorbius]

That sounds like it might have been carbon monoxide poisoning.

https://www.mayoclinic.org/diseases-conditions/carbon-monoxi...

Though symptoms are quite similar to those of CO2 poisoning:

https://www.emedicinehealth.com/wilderness_carbon_dioxide_to...

One of the symptoms of CO poisoning I've heard mentioned is of a sense of doom or dread.

[bjoli]

Nope, that was co2. It is similar to CO, but in animals at least it gives a more aversive reaction.