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. Cats hear extremely well. Their eyes are adapted for vision in dim light for hunting just before dawn and just after dusk, the prime hunting periods. The hand of human breeders is obvious. An estimated 90 pig breeds and 200 pig varieties can now be recognized.