Curious to know if Gossy ever has this happen occasionally.
I notice Kananga does this every now and then. The last two days he has refused to walk in a certain direction. I can tell he's worried about something because his ears are pinned back and he's trying to get out of his collar. I have to pick him up and walk him to where we need to go. Just a few days ago he was fine, it seems like this happens every couple months or so. Sounds similar to what you were going through.