Oxygen cages range from solid cage fronts to purpose built ones with full environmental control. The solid cage fronts have all the same problems as E collars with cling film. The purpose built ones are expensive (up to $40, 000) but they allow you to give near to 100% oxygen, they have soda lime to remove CO2 and they also allow control of humidity and can heat or cool the patients. Being able to cool a dog with an upper airway obstruction while giving them 100% oxygen is a real boon.The cages shown here can take large dogs (up to 40 kg reasonably comfortably). If you need to put bigger ones in there you can. It’s a tight fit, but I’ve used them for giant breeds when I had no choice and they can still be kept cool.And one use that is dead handy is for flippin’ barking dogs (like seizuring patients that are now normal but still need observation). The cages are soundproofed so you just set the cage to use room air and close the front door and Hey Presto! It’s quiet!