A dog's sense of smell is about 1000 times better than a person's. The bloodhound is the only animal whose evidence is admissible in an American court of law. You can tell a cat's mood by looking into its eyes. A frightened or excited cat will have large, round pupils. An angry cat will have narrow pupils.
Cats lack a true collarbone.
Because of this lack, cats can generally squeeze their bodies through any space they can get their heads through. Dalmatian puppies are pure white when they're born. Big dogs have larger litters than smaller dogs, but smaller dogs generally live much longer than larger dogs. Researchers are almost positive that dogs have dreams too. Cats are pure carnivores.