Their dentition is, but I don’t know if their metabolism and digestive system are.
I’ve thought that the ones that are being forced to move south due the melting sea ice might be able to survive if they started scavenging off of wolves. I can imagine polar bears becoming something like modern-day short-faced bears.
Wolves have been one of the best things that ever happened to grizzly bears in Yellowstone. Grizzlies have a hard time hunting elk on their own, but wolves do kill them. And when that happens, the bears can drive wolves off their kills and eat until satiated.