I am sorry about your loss
![Frown :( :(](data:image/gif;base64,R0lGODlhAQABAIAAAAAAAP///yH5BAEAAAAALAAAAAABAAEAAAIBRAA7)
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I do not have gerbils, but I do have rats. I have seen them slowly dying and some have been sudden, at all ages. With rats, I like to let them decide when they want to go to rattie heaven. A lot of people are so quick to euthanize, but I think it is a very scary process for them...I'd rather they die at home in their hammocks with their buddies.
Ralphie (my hairless rat) hasn't been looking or feeling the best lately. I almost had him PTS last Thursday, when his son's went in for their neuters. I just couldn't do it. Why? He may look terrible and his breathing is not food at all, but he is still walking through the cage and eating. He will gladly take food from me. I am keeping him going by giving him some Metacam and baytril/doxy combo. I do not think he will pull through this, he will eventually pass on from respiratory illness (like many rats), but he is holding on and I can't be the one to say "Okay, Ralphie, it's time for you to go".....it is his choice. Now, if he was suffering/limp/not eating/in obvious severe pain, then of course...I would help him cross over.
I hate being the one to decide for my pets to "live or die". I have had to do this only once, and that was for my first pet rat. So far, I have had 3 rats die happily at home with their buddies in a hammock...and that is the way I want it to be.