Sorry about your loss. Dogs are better than most people.
X100.
I'm sorry for your loss as well. I had to put down my Rott- Sasha and My Dobie- Suzie (both rescues) a few years ago. The Rott had aggressive bone cancer- she was 8 and it was the hardest thing I ever did. The Dobie was around 15 and has severe arthritis and kidney failure almost overnight- It was hard to do but I felt that this was the right thing to do for her, not me.
My remaining dog, the Eurasier, went into a depression- so we went out within a few days and found another rescue Rott, ironically named Tasha. A few months later, rescued a malinois off the street and the rest is history.
I could not imagine my life without my doggie companions.
I hate that they die, but such is life... My take is that if they are in my care, they live a good life and are loved. So, when one dies, we mourn and we remember but, then go and rescue another because it's the right thing to do. And frankly, I like dogs WAY more than I like people... and it's kinda funny, I think they like us too... We have our 3 that live in the house and have a fenced yard. However, all the neighborhood dogs( Two labs, 1 basset, 2 or 3 other assorted mutts) hang out near us because we'll stop and pet them, play with them and yes, even feed them...
Sorry to ramble but my dogs are near and dear and I hate to hear of loss...
Just think about the good life you gave Ruka and the good life and memories she gave you. Go and rescue another and pay it forward...