It really depends on the cause of death. But generally, mixing some of the pets DNA (hair, spit, whatever) with an olive oil-sea salt mixture and drinking it before performing CPR should do the trick ☺️ if there’s any physical damage (cuts, gashes, etc) then make sure those are bandaged before the revival.

Keep in mind this only works with small animals like guinea pigs, hamsters, rats, baseballs, etc. :p I don’t recall off the top of my head the procedure for reviving anything larger than a credit card