I also strongly recommend Hiero's Journey, as recommended by Swoop109 above. By the way, Sterling Lanier also wrote a sequel to it, The Unforsaken Hiero, which was also pretty good.
You might also want to try out Redbeard by Mike Resnick. I recall it being filled with mutated humanoids in the far future, although I don't recall the circumstances of the apocalyptic event that caused civilization to fall, nor whether there were mutated animals walking around. It's been awhile since I read it (like, 25 years), but I do remember Redbeard was pretty much a pure-strain human barbarian in an army of mutants.
Johnathan
You might also want to try out Redbeard by Mike Resnick. I recall it being filled with mutated humanoids in the far future, although I don't recall the circumstances of the apocalyptic event that caused civilization to fall, nor whether there were mutated animals walking around. It's been awhile since I read it (like, 25 years), but I do remember Redbeard was pretty much a pure-strain human barbarian in an army of mutants.
Johnathan