So for example a KFC fan might have their passing away referred to, slightly humorously, as "They have gone to the great KFC in the sky..." For dogs, who like bones, you example would be perfect! A sports fan might similarly "have gone to that great stadium in the sky..." as a way of personalising the heaven for that person... or in this case animal.

Hi Yugab ...actually it just means to die, and can be changed as in the examples here: https://idioms.thefreedictionary.com/gone+to+the+big+something+in+the+sky 😊

It is FOR dogs. It is dog heaven. Do not be thrown off by the word “separated”. A glass for wine= Wine glass. Look for the ADJECTIVE PREPOSITION “for” with the Object NOUN or purpose of: <Object NOUN> for <ADJECTIVE PREPOSITION> Object NOUN = Heaven for ADJECTIVE PREPOSITION = DOG <ADJECTIVE PREPOSITION> for <Object NOUN> = <ADJECTIVE PREPOSITION> + <Object NOUN>