Strange behavior by one of my wethers this morning

[Nanno]

It's definitely not constipation. Constipation is very rare in goats and wouldn't have symptoms like that. It sounds almost like he got stung or bitten by something. Could he have been hit by a wasp? Although you say it's pretty cold there right now, so a wasp seems very unlikely. Did you feel his back and sides to see if there is a specific spot that hurts? Could there be a burr in his hair that suddenly worked its way into his skin? I suppose it could also have been a sudden acute belly cramp that resolved itself. In any case, it doesn't sound serious even if it was alarming at the time. Hopefully it doesn't happen again, but I'm sure you'll be keeping an extra-close eye on him for a few days.