How frustrating for all of you!! Weak bladder or not, I have an idea that will keep your floors pee free and your sanity in tact! It takes a bit of patience, but it's EASY AND TOTALLY WORTH IT!!
Get at least 2 bells and mount each one at head height right next to each door that you take Gersh out.
Each hour on the hour, call Gersh to the door and GENTLY nuzzle his nose/head on the bell so it rings PRAISE HIM and then take him outside and tell him to do his business. PRAISE HIM LIKE CRAZY WHEN HE GOES-BUT DON'T DO IT WITH FOOD TREATS.
In the event that Gersh ACCIDENTALLY rings one of the bells (bumps it while sniffing in that area or whatever)take him outside anyway and praise him for ringing his bell. This will reinforce that the bell means time for potty! And in the event that he goes potty -*CELEBRATE WITH HIM!!*
In the event that Gersh has an accident, don't scold, just take him to the bell, nuzzle his nose on it, and take him outside. Not to be redundant, but this also reinforces that the bell and potty equal outside.
I was frustrated with the puppy-potty thing too, but it only took my puppy just about a week to understand that if he rang the bell, he could get outside for potty.
I love that my puppy is bell trained! Since he learned ringing his bell gets him outside to take care of business, WE HAVEN'T HAD ONE ACCIDENT!!!
Give your dog time to learn this, some dogs get it in a week, some take 2 weeks. You must be consistent about nuzzling their head/nose gently on the bell each and every time they go outside for potty.
Try this and you won't be disappointed!
Best Wishes from the Dogue de Bordeaux over here in Wisconsin!