Sandra,how can you possibly assume your cat is ready to go,that's a cop-out:sad:I am sorry to say..
If as you say her"kidneys are going"she needs help,yes,but not to be killed.
14 yrs old is far from OLD.
Why don't you just say,you don't want the poor cat anymore,because she does not like your new dog:sad:
Cats are no less important than dogs and after all,she was there first
I'm afraid you'll not get any sympathy from here,you created this situation,but your kitty will pay the untimate price,that's terrible...IMO!