I've killed one back in 97. It weighed in at about 160 pounds and just made the record book.
I carried a S&W 625 in .45 Colt since I didn't feel like dragging a rifle around all day and with dogs you will be shooting them in distances measured in feet not yards.
One shot with a 250gr XTP was all it took and lodged under the skin on the off side. 4" barrel and less 900fps.