1. Both keep moving...even when they are lost.
2. Both take up too much space on the bed.
3. Both have irrational fears about the vaccuum cleaner.
4. Both are threatened by their own kind.
5. Neither understands what you see in cats.
6. Both want dominance.
7. Both do the dishes by licking them clean.
8. Both chase cars.
9. The larger ones tend to drool.
10. The smaller ones tend to be more nervous.