Hi,
If he is three years old then he should really be eating more food than a mouse - even a retired breeder mouse.
So I vote he is still hungry.
If you can find one get a small rat (40-60g ) and try him with that next time to see if he will eat it.
Do you feed live or F/t?
Is there any chance that, after being tagged, your sister used the same mitten to feed him?
I ask because you say he constricted it which to me means he was in feeding mode rather than defense or agressive mode.
dr del
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