Isolation is something everyone feels at some point in their life. Realizing people have taken the time out of their own busy life to post suggestions here, is learning to be thankful and a lesson in understanding you’re not alone. Turning your back to these helpful suggestions and replying with harsh words will only isolate you more.
Maybe a dog is not a good fit for you right now for whatever reasons but it was still a suggestion. A Thank You with the request for more suggestions would of went a long ways. If you want people in your life and/or the old people back, you might take a deep look at yourself and why they pushed you away, then try an apology, it too can go a long ways.