So, when you are looking for your new doggie friend, you might consider their personality and temperament.
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This is true.
I'm sure our dog would rather be at home with a sitter than at a boarding facility, but I cannot trust anyone to walk her safely around my neighborhood due to her dog fear/aggression. DH and I have made great progress with her since we adopted her last spring, but we've been working with her a few hours each day. Anyone else is not going to be as sensitive to her needs/triggers. So even if it's just one day, she boards with a dog trainer.
In every other aspect she is a perfect pet: super trainable/obedient, travels well, never barks, never chews/gets into anything, never one potty accident, and very sweet/affectionate with people (a favorite at the shelter where we got her and at the boarding facility we use). We have found it's worth the trade-off for this one issue.