That first picture has the dog's entire personality in it.
I got another dog already. I couldn't stand the house being so empty. I do a lot of solo camping and a large part of the experience has always been having a K9 companion along with me. We adopted a stray from the county shelter. 5 month old German/Anatolion Shepard. He's gained about 20 pounds in the month we have had him.
Meet our new puppy. We are using the name the shelter gave him, Chester for now. It actually fits him. I have been calling him "The Dude", but the wife is not pleased with that. Might name him Titus after the Roman emperor and military leader. He is a 5 month old stray, and is 50 pounds of...
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I thought about everything you mentioned. The main reason I felt I had to get another dog was because my Sasha was such a awesome dog. There are thousands of dogs out there that would love to live a life with me, or you. Dogs are too much of a part of my life to be without one. It has nothing to do with being fair to the memory of a lost and loved pet. They would want you to be happy, that's all dogs really seem to care about is their master being happy. I look at my big goofy puppy and I do get sad sometimes because I am still missing Sasha, but then he does something that makes me smile. Don't let grief interfere with filling that void. I believe that when its my time to go, all the dogs I ever had will be there waiting for me. Part of having a really good dog is knowing that they don't get to hang around here very long, but you will see them again, my friend.