Sadly take the dog back right away. Most reputable rescue organisations will take a dog back, especially as you have done your best. They want a successful, happy placement too & when it genuinely isn't working out they'd rather you told them.
How should a family manage an estranged relationship?
Why on earth would anyone plant.....
Only 50% of middle age adult manage more than 1 brisk 10 min walk a month.
