Home Euthanasia for rats

I saw a previous forum about this with alot of misinformation on how to us co2 for this and its effects. You could put a rat in a fridge sized cardboard box outdoors, tap up the edges, add maybe 15 punctures with a knife(try it before hand so the box doesn't pop, you'll find the right amount), rent a 10lb co2 cylinder and ask the man at the counter about the effects of co2. They will say that at 5000ppm(fully opened cylinder will easily achieve this) you will pass out and die before you even knew what happened. It is instant when done right(not hard to do, just need a lung full of co2 and you will die before you knew what happened), which is why you should do it outdoors and step far away while the co2 is flowing(Perhaps a fan blowing across the slits in the opposite direction of you). It's less than 50 dollars to rent the filled cylinder, ask about a regulator. Hope this helps, they really won't suffer at all. Offhand thought, you could get the rat familar with the box a few days before hand and then wait for it to fall asleep when the time is right and do what you must. It could be any animal really, I reccomend getting the advice of a vet as to the condition of you pet, and I would not be swayed by a vet about them doing the job though. A tad bit of effort and a lower cost than having the vet do it, you can truly send your pet off peacefully.