Hey! Poor little guy a fight with a raccoon sounds rough. Well since he's still young the owner may need to work with him on assuring him that when he leaves its ok. For example, leaving him alone in room for a few mins and using positive reenforcement for when he doesn't cry and slowly making that time longer and longer. When he cries again start over. I know it sounds like alot but just takes time to get him use to being alone or away from the owner. Also having the owner come in and out of the front door for different amounts of time to desensitize him to the owner leaving. Did the owner leave you with anything that smells like them? This can help comfort them too. As far as the walks it sounds like he just needs to know while it's scary he will be ok. You can even try practicing his sit and stays and "watch" (where he looks to you) to distract him from things that might scare him so he focuses on you or owner instead. Hope this helps!