re: electric fence or gps collar advice please

I had the base station forget which brand but it was about 1/4-1/2 ac. It kept my 7yr old choc lab for a year or two then one day he broke out and from then on it wouldn’t keep him. I watched him walk through it taking the shock and then just walk off down my driveway. One hour later he would act like he couldn’t cross the line in my side yard and I had to make him follow me across even with his collar off.
It may work on some dogs but they don’t work on all dogs