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I noticed a while back that the threshold in the doorway from the back yard to the sunporch had the head of a finishing nail showing, but I kind of scuffed it with my foot and it seemed OK. It was right in the exact spot of the doorway Dolly goes through to go in and out. Finally weeks later I bent over and felt it. Sure enough, it was sticking up more than I thought. Probably enough to catch and tear a diaper, or to catch a thread on a diaper that already had some wear, and tear it further. So she has probably been wearing out the seat of her pants faster because of that snag in the doorway.
It is fixed now. A couple of taps with the hammer, which I could have done weeks ago if I'd realized. If your pet wears out diapers, it is a good idea to take a close look at the surface they are bouncing or dragging on.
I have a stack of plastic bags that they give you at the vet when you buy supplies. They are super sturdy and thick and tear-proof. I made one of them into a diaper cover for Dolly and it is perfect. She did not tear it at all. Really, as much trouble as I had getting the hole in the corner (could not tear it by hand, had to use scissors) I think one bag is going to last a LONG time.
Here is a picture of Dolly in her bag, just coming in from outdoors.
And here is a picture of how I cut the bag for her to wear. The little 1.5" hole in the far corner is for her leg to go through. The reason I snipped the handles open was to be able to stretch the ends to have plenty of length to knot it around her waist. So I think this is finally the solution. The grocery bag was a good idea, but we just needed better bags.
And she's a really good dog, but she's usually in high spirits when she comes in from outdoors, so I have to get her to hold still so I can change it, when she's all excited. I don't think I've ever said this, but this is how good she is. When she knows it's time to change her diaper in the afternoon, she lies down on her side with her leg side up so I can unvelcro the old diaper. Then when I go to put the clean one on, she sits up so I can get the pad under her and fasten it. But she doesn't do all that when I have to change her because she's wet, because she's excited and it's an unscheduled change I guess. But mainly, we just don't want wetness around her waist against her skin if we can avoid it...