He might be in some physical pain as well. Thor has bared his teeth at me a couple times, and it was because of pain - once because I tried too long to get a topknot in with a rubber band, and once because I touched his tummy when he was sick.
Honestly, Thor's head doesn't have a lot of room - like, we moved offices and he is suddenly pooping indoors again, which he hasn't done in a year. I mention this because if your little guy was scared, he might be very discombobulated and still need time to adjust to being home.
I'm glad he's back with you! Keep an eye on the back leg, though.
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