I have a 4 year old royal palm tom turkey. He hasn't been very vocal the last couple of weeks, but otherwise has been healthy and seemed fine. But two days ago, he did not get off his perch and his head was drooping. Head is bright red, no other symptoms except head drooping and getting weaker. He had a respiratory problem about 2 years ago and I put him on SMZ and he recovered, so I did the same this time, even though there was no wheezing. Giving it twice a day, but no improvement. any ideas?