Is the fence grounded someplace on a weed or grass? If it is ticking really fast that usually means it is grounded someplace. IF all else fails touch the fence, it only hurts for a second. I have done it many times. You might also think about putting up another strand. You may have to tie him till you can get your fence working properly, if you have no place else to contain him.
"Until one has loved an animal, part of one's soul remains unawakened..."
- Anatole France