About to lose my chin :(

So I took Tseng to the vet yesterday to have his teeth looked at. They looked different and he was suddenly not eating much so I thought maybe they hurt. As it turns out... his kidneys are failing. They gave me some medicine for reducing acid and such, and told me to stuff him with critical care, but its basically just about making him comfortable until he takes a turn for the worse, at which point they told me I should have him put to sleep to minimize his time in pain. I don't know how to make myself do that when it comes time. How do you take your little one to somewhere unfamiliar and scary and ask them to kill him? My dog had to be put to sleep a year or two ago and it was so hard.



I have another concern though and that's his cagemate Elena. They're a bonded pair. They are rescues so I have no idea how long they've been together but they are 11 so potentially a long time. What can I expect from her when he goes? I'm terrified she will pine and be lonely without him. What should I watch out for? And what if anything can I do for her?



Dani