Are you in Finland, Neriz? How interesting.
I think you've got all the reasons for not adopting this dog down. You've reasoned with yourself, and you know you can't do this and be fair to your other puppy. I'm a softie for needy dogs, too, but unfortunately, we can't take them all home. (I live in a pet-free apt now, so I can't take any of them home. Sob.)
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