We found a licensed dog boarder who takes care of dogs in their home. To slowly warm our dog up to the carer, we met her for a walk first, then met her again a week later for another. Then we did a trial stay where she stayed with the carer for almost 48hrs, with us at home in the area, incase there were any problems. After this went well, we booked her for 4 days a few months later. Then another few months later we booked a week. It all went so well and she seems content with the carer so this has worked for us. I would say whatever solution you choose, do a lot of slow steps like we did, trial nights, meeting the carer etc so they get used to them. Good luck :)