Belly bands work great. If you rely on them they will wreck your housetraing though- speaking from experience.
I get mine from
www.barkindogclothes.com. The owner, Rena is a YTer and offers a 10% discount to members. SHe's very easy to work with and super fast. Good luck!
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"If you have men who will exclude any of God’s creatures from the shelter of compassion and pity, you will have men who will deal likewise with their fellow men." — St. Francis of Assisi, 1181-1226