We have an older pit/husky mix rescue dog he is about 7.5 years old and recently has gone from an indoor dog wanting to be with us to an outside dog who is afraid to come inside. He has been starting to not eat unless it’s also outside. The only thing we can think of is we recently used a bug zapper inside (not on him) and he is afraid of it. Or he may of been abused in the past. Any suggestions would be helpful.
Try turning off the bug zapper and see if that solves the issue.
Many bug zappers emit high frequency sound waves that are advertised as "cannot be heard by most humans and house pets" where MOST is a keyword.
It may be that the sound the zapper makes is so annoying to him that he would rather be outside.