When they had their first puppy, he was a boy and they were very happy, naming him Tick in expectation of the sound they thought he would make, but when they would wind him up, he went "tock, tock, tock", which scared them and they went to the Hall of Records to change the name, but couldn't. They then had another son, expecting him to tock too, and naming him Tock, but he ticked, so they decided to give up having children.
Now, they are in an organisation to help end poverty.
The watch-dog gene is on Tock's father's side.