Awh, I'm sorry to hear that. R.I.P Oreo. ; ;
I have two guinea pigs currently and they are most likely both 4 years old. 2-3 years from now I know they will no longer be with me, which saddens me when I think about it.
But hey, all that matters is the great memories you had with your pets!
Oh rest in peace Oreo hamsters are lovely, as are gerbils and guinea pigs. I used to have chinchillas too.
The last guinea pigs I had I bought from a very well know pet store, turns out they didn't get the gender right for them as I woke up one morning to 3 baby guinea pigs the one poor thing passed away which was really upsetting. Kept one and homed another. I'm also the only person I know of who took their pet rat to the vet when they didn't look well...
As far as I'm concerned these little furry pets are just as important as bigger pets