I do agree with everyone's sentiments that it's sad, almost pitiful

My friend recently lost her dog of 15 years and I have been consoling her. I told her he'd had a wonderful life, it was the right thing to put him down before he was in too much pain etc. etc. and she tells me "i know he was happy, but he was unique. i'll never have another dog like him, and that's what makes me sad."
I completely sympathised with that, as when my old cat died when I was 12 I remember thinking how upset i was that I would never seem him again. I love all cats, and all the ones I've had since are so special, but he was entirely unique and nothing could replace it.
It hurts to think that, but also when you get over the pain, it gives you happy memories. She may resent the new puppy and scorn it if it doesn't grow up to be like Booger.
(by the way, does anyone else find booger to be a horrible name! As in, snot?!)