Cyanosis, when caused by hypoxia as opposed to circulatory abnormalities, always puts an animal into the critical group. It is always imminently life threatening and should be treated and fixed in seconds to minutes. When dealing with cyanosis due to hypoxia, you should NEVER look at an animal and say things like “He looks kinda cyanotic” or “Hmmm, I think she’s a bit blue?” Cyanosis caused by hypoxia is an absolute, degrees are irrelevant. Your response must be immediate and decisive: OXYGEN then a rapid analysis of which level of the respiratory tract is responsible then hopefully definitive stabilisation.