I recently had to make Peaches wear diapers all day (she just turned 15), but she is able to hold it at night (how does that work??). Since I'm home all day, I take her out every couple of hours to pee and poop. Occasionally, she has had an poop accident in her diaper, and I just throw it out and give her a "butt bath" with either a wet napkin or water and soap depending on the severity. If she's had a pee accident in her diaper, I use a wet napkin and thoroughly wipe her privates and legs, and then give her a bath every week.
Now about the diapers, I couldn't see myself using "doggie diapers" that cost $30 each! I chose this method instead, and I have to say, it's worked beautifully for me: buy little girls undies, size 2T/3T, and use half a regular Poise pad in them. It fits Peaches' butt perfectly with a little hole cut out for her tail, and the Poise pad works well to collect the pee. I bought about 30 undies and kept them all ready with half Poise pads cut up and adhered to them. I end up using 1-2 diapers every day. Tip: use the regular cotton thick Poise pads, not the ultra-thin ones. They are useless and a pain to remove and throw out. I just peel off the used pad and toss the underwear in the laundry.
Peaches, born June 6th, 1997; rescued me July 1, 2006; entered heaven on February 15, 2013. 15 years, 8 months, and 9 days.
Peachy-weachy used to say, "My mom thinks I am strong, resilient, and adorable. I guess moms know best!"