Shiva Purana
नाभिनिंदेदधिगतं न प्रणुद्यात्कथंचन ॥ अपि श्वपाके शुनि वा नान्नदानं प्रणश्यति॥ ३५॥
He should never condemn what he has achieved nor should he reject it in any way. Even if it is a dog or a cat, food is not lost.
english translation
nAbhiniMdedadhigataM na praNudyAtkathaMcana ॥ api zvapAke zuni vA nAnnadAnaM praNazyati॥ 35॥
hk transliteration by Sanscript