I had to kill my dog and I am so devastated and torn and I don't know what to do and I'm scared. I need help.

I used to watch another breeder's 4-month-old male on the weekends, help her with socialization, then last week she said she couldn't keep him and wanted to know if I would buy him off of her and then she never texted me back. I thought nothing of it, ha ha she decided to keep him, and then she texted me on Friday at 5:00 p.m. and said she's moving, she can't keep him and asked if I could come pick him up. So I did.<br><br>He is really cute and I like him, but he is very very very very feral. He is very dangerous and will attack you. He was biting me the whole ride home and was so scared and he hissed at me. He was hissing at me all night. I don't know what to do with him. He is so dangerous and I can't help but be scared of him. Not only that, but I was on a waiting list for a puppy, and I got the call while I was driving home that the litter was born and my puppy has been born. I'm so excited and I'm so perseverated on this whole thing with hissing guy.<br><br>He has bitten multiple people and hurt multiple people. I'm going to get him neutered and that will help, but I'm just so confused and I don't know what to do. He's very very very very very cute and I really like him. At the same time, he's feral and dangerous and I'm scared. I'm so confused.<br><br>Tl;DR I bought a dog that is feral and bites people and hurts them and I don't know what to do. I'm devastated and I need help.