Have 3 yr old female swan who appears not to be eating. Was previouly a hearty eater First noticed 4 weeks ago when brought up from pond for winter. Took to vet,blood test did not reveal anything except kidney function, said almost like drinking too much water. Weighs 15 lbs and does not seem to feel emaciated. Put on Baytril and wormed but no change. Think blood test was only a smear type. What do you recommend next step