Two of my three silkies are very ill. Terrible diarrhea, not eating, today staying in bed. They've had a history of not eating at times with diarrhea that the vets can't figure out. They were doing great then crashed. I've been syringe feeding for a week. Now getting much worse. I decided to try Oxytetracycline, which I started last night. QUESTION: Can I give Valbazen at the the same time? Things are critical. I am doing everything I can. Very clean coop and run, clean water and food always, no external parasites, no respiratory symptoms, crops are fine, eyes look fine, mouths look fine, no blood in poop, etc.. Thank you.