My brand new blue eyed leucistic male with a condition so rare it is considerd a myth

[Zoe]

slander: a malicious, false, and defamatory statement or report
http://www.dictionary.com/browse/slander?s=t


it's not slander if the breeder was indeed selling sick animals. it would be stating a fact.

Yes but, "ya I'm sure it's true" is very different from "I can prove it's true".