All so true PP...neither do they go through packs of toilet rolls at a rate of knots. And even if they did use toilet paper, the cheap stuff would do them every bit as well as the expensive ones.
I have thought of another few reasons :::
1. A dog sees no need to redecorate every two years.
2. Link to 1 above, dogs therefore rarely require to spend hours every Sunday in B+Q choosing wallpaper, and eventually buy the first one they saw.
3. Dogs see no needs for shoes of any king but if they did, they would settle for comfortable ones, rather than ones that looked nice to other dogs.
4. Dogs forget all about their mothers within about 48 hours of leaving them.