I lost a retriever when I was little. He was chained up because he was known to jump the fences. He had plenty of chain, but he had wrapped some of it up around something and then jumped the fence because he saw me leave and wanted to be with me. I’d assume the same kind of thing happened here. Prayers for the dog.
I hope that’s the case. I get darned near homicidal when I read about animal abuse. I’ve seen (and heard about) too much of it.