7. SOME PUPPIES ARE BORN GREEN.
Sometimes, a puppy in a light-colored litter can be born green. On two different occasions in 2017, in fact, British dogs made the news for giving birth to green-tinted puppies. In January, a 2-year-old chocolate lab in Lancashire, UK gave birth to a litter that included a mossy-green pup. Her owners named her FiFi, after Fiona, the green-skinned ogre from Shrek. Just a few months later, a golden retriever in the Scottish Highlands also gave birth to a puppy with a green coat, a male named Forest. How did the puppies end up looking like Marvin the Martian? In rare cases, the fur of a light-haired puppy can get stained by biliverdin, a green pigment found in dog placentas. It’s not permanent, though. The green hue gradually disappears over the course of a few weeks.
8. PUPPIES DON’T FIND YOUR YAWNS CONTAGIOUS.
Ever notice that when somebody yawns, other people may follow suit? Contagious yawning, thought to be a sign of empathy, affects humans, baboons, chimps, and yes, dogs. But as research published in Animal Cognition suggests, young canines aren’t susceptible to catching yawns from birth. In the 2012 study, Swedish researchers took a group of 35 dogs between 4 and 14 months old on closely monitored play dates, feigning yawns in front of each individual animal. Dogs that were less than 7 months old didn’t react, yet many of the older dogs would respond with a yawn of their own. This pattern mirrors what happens with humans—children don’t pick up the habit of contagious yawning until around age 4, when they start to develop social skills like empathy. These results suggest that dogs, too, may develop empathy over the course of their puppyhood.
9. PUPPIES LIKE “BABY TALK” MORE THAN THEIR PARENTS DO.
Like humans, puppies seem to grow out of baby talk, recent research has found. As part of a 2017 study, 30 women were asked to look at assorted photographs of people and dogs and utter this pre-written line: “Hi! Hello cutie! Who’s a good boy? Come here! Good boy! Yes! Come here sweetie pie! What a good boy!” To the surprise of no one, the human test subjects spoke in a higher register while looking at dog pictures, especially puppy photos. Afterward, the researchers played the recordings for 10 adult pooches and 10 puppies. Almost all of the pups started barking and running toward the speaker when they heard the baby-talk recordings. In contrast, the grown dogs pretty much ignored the recordings altogether.