Wolves not eat only raw meat, they eat bones, cartilages and organs togheter as coat and skin.
If you only give raw meat for your dog he will surelly have kidneys problems as lack of some nutricional points, but if you give a complet carcass this situation change.
And no, wolves don't die with kidney problems caused by raw meat as I know, they die because parasits, wounds and viral illness like distemper and rabies.
A 8 years wolf is already a good age that few animals arrive in nature, with this age his body don't work as when he was yung, not such endurace, not such recovering and not such good imunologic system as before, but even like that you can easly find on youtube a material about the "druid's pack" grey wolves pack guide by an alpha couple with 9 years old wich die in fight with other pack.
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