I breeds full pedigree dogs earlier this year, know problems accured and we had a small litter of 3. 2 pups went to fantastic homes and we decided to keep the 3rd. Dam started to get less caring and becoming a little aggressive with pup who is now 6 months so I made a tough decision to try do my best and find her a better home. Put things in place and so on. I find her a home the man was wanting a pup so told him about my pup.. I introduced and vetted owner and also reduced price with pup being older. Now pup has been in new home 2 weeks and they want to return it. Advice needed please