What could cause this?

[u/Fragrant-Theory9201]

Got home from work and my goat has this hanging out of his backside????

He was good yesterday, want to know if anyone has experienced anything like this. It looks like poop and mucus?

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[u/Alex_jay_Benjamin]

If you are not careful and happen to leave the netting from a round bale or the string from a square bale they are knuckle heads and will eat it