I think the pic you are using is going to be difficult to show well given the size constraints of an avatar. Remember, the maximum size is 80 by 80 pixels or 19.5 KB (whichever is smaller) so you may have to crop the pic to just the dogs (cut out the sides) to bring the dogs forward in the field of view. But it still might just be too far away to give much clarity.
It's a lot like looking at a pic on TV. If the screen is small, a distant, smaller subject shot is going to be harder to make out. Play with it, is really all you can do. And if it doesn't look right just get another photo trying to be closer in so it's clearer in a small frame.
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