1. *don't* use a sanitary napkin -- use a continence pad!! They are made to hold very thin liquids and it won't leak as badly. I usually buy the super thick ones and very LONG -- then cut them in half. Use nylon first-aid-tape to seal those cut edges (it won't scratch him but it won't repel liquid either).
2. Make sure he goes out regularly -- don't let him lose the desire TO potty outside
3. Try using vet wrap (you can get it in the first aid section of any drug store - it's just not in colors) == don't get it too tight but it will help hold it on better.
Good luck!
"The best and most beautiful things in the world cannot be seen or even touched. They must be felt with the heart."
Helen Keller
