If you chop down a tree, any dog named Idefix who saw you do it should become hostile, in reference to how Idefix in the Asterix comics is distressed whenever a tree is damaged.

Cavemen could be buffed in the early game by starting with a dog or large dog instead of a little dog. Or, to make the buff significantly stronger, they could start with a pet mastodon.

A pet dog named Huan will one-hit kill any lycanthrope, as a reference to the dog of the same name in The Silmarillion.

Frisbees, a plastic weapon using boomerang skill. Deals only 1d2 damage, but can fly in a straight line at extremely long range. Frisbees thrown at dogs might tame them.

Dogs are buffed to be better fighting than cats as a starting pet, but lose their ability to curse detect.

Dogs will eat candy bars off the floor, but will then get sick or nauseous from eating it.