Before talking about Washable vs Disposable Diapers For Dog. We should know difference between Washable and Disposable Diapers.
Washable dog diapers are long lasting that can be use for many days and in some cases for couple of months. disposable diapers usually work fine for upto 12 hours but it depends on quality of diapers and quantity of urine and stool of your dog.
If you have enough money disposable diapers are better and if you have time washable diapers are better.