Pixie
I have always fostered senior dogs (some I have ended up adopting).
Give the little one time. He will come around. Everything is strange to him.
As for him being in his tent most of the time, he feels safe there.
The ones I fostered would stay in the pen (the gate was always open) and eventually they would wander out in their own good time.
You have only had the little one a couple of days, not really long enough for him to realize he has a new good home. In a few days he will probably act like he owns the house and you
Thank you for rescuing him.
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