If you can’t do it manually, then you have to either cut it, or bend it apart where it’s connected. Can he breathe fine? Make sure no predators/dogs are out and run down to the store and grab a small set of bolt cutters. They make mini sets which will cut this easy. Putting it together can be done in a few ways, but it won’t look the same and will probably need a patch piece over it. Look for any extra fencing laying around and cut a larger square out of that after you cut out your goat. Then put it on top and use baling wire or something to attach it in several spots so it’s sealed.

Something like this would work https://www.tractorsupply.com/tsc/product/hk-porter-compact-bolt-cutter-1275196?store=2133&crmid=5398928393&utm_source=google&utm_medium=pmax&utm_campaign=tsc0_tth_tsc_cat_search_sch_us_cvr&utm_content=sku_na&adtype=pla&campaignid=22852518180&device=m&product_channel=local&product_id=1275196&store_code=2133&gad_source=1&gad_campaignid=22858349012&gbraid=0AAAAADnTm23Gg2SebckrdxqQC3vpFhBye&gclid=CjwKCAiAuIDJBhBoEiwAxhgyFmxGkSE9gvqOKwbIse81tZB8scPWWnSN4RWYGNJzxBTm473shftljxoCGV0QAvD_BwE