My Cody, who was a severely abused rescue, aboslutely will not let anyone into the yard. Especially if it is a man! One foot off my property, and she is FINE! But, she is so protective of me as her "rescuer" and of her "den," that I have to keep her inside or on a leash if anyone enters my yard or house! UGH! But, like Logan suggested, my vet suggested introducing people gradually, under supervision, asking them to allow her to adjust to them by smelling them, seeing me interact with them, and having the visitor give her treats. This has helped a lot. Many people she once feared are now her BEST friends! Unfortunately, with many rescue dogs, their behavior is a product of the abuse they may have suffered in the past. It does take time and patience. And obedience classes, animal behaviorist etc. as Logan suggested is always a good idea. I hope and pray that things will work out for you both. Thank you for trying, and don't give up yet! Hugs to your pup