I've used rutin in a couple of chylo cats and had complete resolution- but I
can't say with absolute certainty if the rutin was responsible or if
resolution was due to a combination of rutin and a low-fat diet and
intermittent thoracentesis, or if the cats simply had spontaneous
resolutions- which does happen.

If I were you, I'd certainly give it rutin and a low-fat diet a shot-- but I
wouldn't wait too long to see if it works because chronic chylo can cause
severe, irreversible,  fibrosing pleuritis in cats.

Here's an abstract of a study on rutin that you might fing interesting:

J Am Vet Med Assoc 1999 Aug 1;215(3):345-8, 339

Use of rutin for medical management of idiopathic chylothorax in four cats.

Thompson MS, Cohn LA, Jordan RC

Department of Veterinary Medicine and Surgery, College of Veterinary
Medicine,

University of Missouri-Columbia 65211, USA.

"Four cats with idiopathic chylothorax were given rutin. Three of the 4 cats
had

clinical improvement, and complete resolution of chylous effusion was
evident in

2 cats. Idiopathic chylothorax in cats is a condition that may be difficult
to

resolve with medical or surgical treatment. Currently, thoracic duct
ligation is

considered the preferred technique, but expense and a guarded prognosis for

resolution may make this procedure undesirable to cat owners. Rutin

administration may offer an alternative to traditional treatments or may be

useful as an adjunctive treatment."

Best of luck,

Phil