Hi so I found the (aggro to me) gator and tamed it as a pet. Later on once tame wore off and I to tame it once more the gator became aggro (which is fine) but I couldn't tame it again.

> tame
Your defensive spin deflects an alligator's bite.
An alligator dodges your piercing cold.
Your claw MUTILATES an alligator!
You have become better at brawling (82%)!
An alligator avoids your claw at the last moment.
An alligator has some small but disgusting cuts.

> You calm an alligator down.
An alligator now follows you.

THEN LATER ON...

The Warm River Delta


An alligator has arrived.
It starts to rain.
An alligator stops following you.
You feel ready to tame a wild beast again.
The sounds of combat erupt near ranger!
You dodge an alligator's bite.
An alligator has a few scratches.

>
An alligator's bite decimates you!
You dodge an alligator's bite.
An alligator dodges your piercing cold.
Your claw decimates an alligator!
Your claw EVISCERATES an alligator!
An alligator dodges your claw.
An alligator has a few scratches.

>
You dodge an alligator's bite.
Your piercing cold MANGLES an alligator!
An alligator dodges your claw.
An alligator has some small but disgusting cuts.

> tame alligator
An alligator is not usually aggressive.
An alligator has some small but disgusting cuts.

> tame alligator
An alligator is not usually aggressive.

When fighting a mob that ISN'T aggressive, you can't tame them.
Stop fighting him first.