Ashley,

This is not the first time you've had to give up a dog is it?
Maybe you are not the trainer you think you are, maybe Chewy
would do better with different people & consistant training
methods. Give Mugsy & Mike a chance with him please.With so
many dogs having health problems that they fight to find a
cure for; to put a dog to death for behaviour problems that
could be corrected, seems pretty drastic.Show how much you
do love Chewy by giving him this chance. Just my opinion.