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it all comes down to quality of life. if a pet can no longer walk, eat, sleep, is in pain, or cannot properly eliminate, it is time to consider next steps to take
This is the best way to sum it up, really. Our pets rely on us to do what is best for them...no matter what the sacrifice on our part. If your kitty no longer enjoys life at this point(especially at her age with kidney failure), it will probably only get worse as time passes, so there is nothing at all wrong with helping her to the bridge when you see fit. The way I look at it is if we know they will only be getting worse from this point on, keeping them alive just to have their last days be more miserable than necessary isn't doing them any favors. At that point, we are only holding on to them for our own sake and that isn't kind.
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She's constipated, is losing weight, her back legs are wobbly and she sometimes loses her balance but I don't know if she's in pain
These are all symptoms of the kidney failure. The wobbly legs and loss of balance are contributed to the kidneys no longer ridding the body of the toxins as they are supposed to, so it causes some neurological problems as those toxins effect the brain. Those symptoms can come and go in their level of severity depending on how hydrated the body is at the time, etc., but ultimately, at that point in a kitty's life, they are usually not having much fun and feel pretty miserable overall.
Euthanasia is all a matter of opinion as to when it is the best decision. As a vet tech, I have seen far too many people let their babies suffer horribly trying to keep them alive for as long as possible, and it breaks my heart everytime. If the animal isn't gaining anything from the treatment, such as showing signs of feeling better, than it is selfish to make them stay. I might also add that it is almost always, in the case of kidney failure, much more kind to help them over to the bridge than it is to let nature take its course. It is a horrible death for them to face in the end....mother nature can be very cruel.
I know when it came time for me to make that decision for my girl, I really needed to have someone tell me that it was okay. That it didn't mean that I didn't love her (just the contrary, really), and that it didn't mean that I had failed her as a mommy because I couldn't fix her. I felt as though I was betraying her, it just didn't feel right to try so hard to keep her with me for all those years and then turn around and take that life I had fought so hard for....in the end, it's part of what we signed up for. You obviously love your kitty very much...17 years worth (and seeing her to the age of 20) says it all...and you will only be proving that love to make such a sacrifice of your own heart to spare her any further suffering. It sounds as if you know her time with you here is coming to an end regardless of what you do, so I'm telling you now...it's okay to spare her the suffering and let her go..
Your friend in grief,
Kim