Bloodfang Sabretooth died, chance to recover?
You can revive your pet with an certain amount of red leaves like this article states:
Pull up the beast menu by hitting right on the control pad and highlight your ill-fated pet to revive it. You’ll need red leaves first, though, so be sure to stock up on those.
The problem is that if you play on survivor mode you can never revive your pet, you need to capture an new one. If it is a legendary beast you're short out of luck and can't get one anymore, any other beast is capturable again.