I have never met a small dog who I could interact with on the same level as a larger breed.
I feel you might feel this way after having a German shepherd.
My dogs don't do alone. maybe about twice a year for about two or three hours.
How far is the nearest rspca or other rescue shelter place, and would it be fees able to leave him there
or somewhere else in company?
In my experience, what nearly all dogs want is company, mental stimulation in a pack mentality
Exercise insist as important for most, often many dogs will substitute lack of company with exercise.
If you weren't far from a rescue place, you could talk to them and explain your situation.
There's usually a few foster volunteers in every place,
I'm a dog person and would have no bother doing this kinda thing, the more the merrier.
I am a bit weary of doing this, as I'm afraid of diseases in these places though.
My fellas getting on aswell, and need to give him all the attention I can.
Otherwise I would be covered in more dogs
I can't seem to understand why anyone here would dislike hairs, but not mind sawdust.
I think if you spent some time talking to some folks, you would have the best chance of finding a dog that's right for you.
A suitable rescue dog that knows "the other side" will be a faithful companion and not leave your side.
You could foster a dog with someone else, I'm sure there's some folks that cant foster the dog 24/7.
This kind of thing is getting more flexible with internet and such, It doesn't seem all that strange
Worth a shot, there's a lot of dogs that need company,
I would find it very rewarding to rehabilitate some dogs I came across, whilst looking for a companion for the ol boy.
This might help you.
Diet is a huge thing that's very complicated, if you do find a dog that is hypoallergenic
It is the most challenging thing in my book, everything else is a way of life
Hope you find what your looking for
Good luck
Tom