Mesmer Charater Cant Be Ranger >>HELP<<

I Cant Seem To Be A Second Prof. Ranger For Some Odd Reason. The Quest Ask To Go To The Status And Charm Animal But I Already Have A Pet. It Will Not Let Me Charm Because I Already Have A Pet. I Tried Leting My Pet Die And Charming Another At The Status But That Didn't Work Can Someone Help Me Here?

P.S.- How Do You Get Another Pet Instead

There is an animal tramer that will take your pet from you right next to the ranger that gives you this quest. Give your pet to him