I'm so very sorry to hear about your loss. I have 2 elderly pets of my own, and I often wonder what will happen when one of them passes on.
My suggestion sounds a little radical (although not nearly as strange as teaching a dog to pee outside), but I wonder if you should get a puppy. Many older animals get very maternal (whether or not they are female) with a "baby". Although your dog definitely misses his uncle, he is probably more lonely than anything else. A puppy (I would suggest a small breed, since your dog is tiny) is naturally affectionate and distracting -- which might be just what your dog needs. Puppies are not usually viewed as a "threat" by an older dog -- which is why I wouldn't suggest adopting an adult dog.
I hope that time makes the loss easier to bear for you all. Good luck.
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Sue
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