Vet wants to put Midnight down?

[Jennifer Madon]

My vet says that the reason Midnight isn't responding to the antibiotics 
or the Feliway (he still pees not sprays everywhere) is because he is in 
renal failure.  My vet is all for helping animals but says this is a one 
way street and there is pain and suffering at the end of the street.  He 
suggests we say our goodbyes and put him down.  I do not have a clue 
what to do or how to respond to this.  We have only had him since the 
week after Christmas when he found us. Any suggestions?
Jennifer