I was gifted a dog years ago was obvious from day one it had taken a good shock,all fences were a complete no go,wouldn't even step over a painted white line on the playing field or a bit rope laid on the floor,next to useless
Leave it be,if it gets out all well and good if it dies it soon rot and dry out you will be none the wiser its even there,get the chimney capped off with mesh or what ever it is they use stop it happening again
Is that the lake on the holiday caravan site,I caught the record carp out there about 10 year ago 24ib,not big by any means but big for that puddle lol.also had a 5ib perch at whit vane but was fishing for tench at the time gear was a bit heavy to enjoy the fish of a lifetime but these things happen