Springwatchs

Opinions are divided on whether dog owners should allow their beloved pets to lick their faces or not – but Springwatch’s Chris Packham has some strong scientific backing for his take

It’s one of those questions that can divide even the closest friends: would you let a dog lick your face? Medical opinions vary.

Professor Graham Roberts, honorary consultant paediatrician in paediatric allergy and respiratory medicine, is quoted in medical journal The Hippocratic Post as saying that that babies brought up in homes with pets are far less likely to suffer from allergies than babies who grow up in pet-free homes. He states: “If you are born into a household where there is a pet, you are less likely to be allergic.”

But others, such as Professor John Oxford, emeritus professor of virology and bacteriology at Queen Mary University of London, is strongly opposed to excessively close contact with dogs.

He points out: “It is not just what is carried in saliva. Dogs spend half of their life with their noses in nasty corners or hovering over dog droppings so their muzzles are full of bacteria, viruses and germs of all sorts.”

But for BBC Springwatch’s Chris Packham, there’s no debate. Speaking on the Oh My Dog podcast, the naturalist told host Jack Dee: “When we cut our finger, what’s the first thing we do? We lick it. And you lick it because there are bacterial fauna in your saliva which have antiseptic and healing properties.”

Similarly, he says, there’s a health benefit to be gained from dogs’ saliva: “In days of old, when they were having medieval battles and doing unspeakable things to one another with swords, there were a lot of wounded people and they would allow the camp dogs to come and lick their wounds. They discovered that if the dog was licking the wound… it would be less less likely to get infected.”

All domestic dogs are ultimately descended from wolves, and Chris says that while a small amount of a dog’s saliva can be good for us, wolves’ saliva has even more healing power: “I’ve been licked by wolves, been kissed by wolves,” he says, “and they have even cleaner, or bacteriologically richer, saliva than than dogs.” They’ve never been treated with antibiotics or other medicines that might compromise their natural state, he says.

Chris adds that when wolves lick each other, it’s part of ensuring the survival of the pack: “When wolves go back to their their den, in order to carry the food which they may have caught many kilometres away, they eat it and swallow it, and partially digest it.

“So when they get back to the den, the pups lick their lips and that stimulates the adult wolves to regurgitate the food.”

“Now obviously,” Chris adds, “dogs have lost that habit – they don’t regurgitate for their young. But that licking is retained into adulthood in dogs because it’s a greeting.”

Similarly, he adds, when dogs eat each other’s poo, there is a valid reason for it. While it might seem disgusting to us – providing support for the opponents of face-licking – this also dates back to wolf behaviour.

“Research has been done recently in California,” Chris explains, “which shows that they will only eat faeces that are between one and two or three days old.”

Chris adds: “It was a relic to wolf behaviour. Because adult wolves will come back and eat all of the faeces in the den area when they’ve got cubs… because it’s a way of reducing parasite load because the eggs of those parasites are in the faeces, and they don’t want their young to get them.

“So that apparently appalling behaviour, because everyone’s nauseated by the fact that their dog eats other dogs’ faeces, that comes from the wolf and it’s about reducing parasites.”