Dogs lick babies’ feet for a combination of reasons: the salty taste of skin, an instinct to gather information through scent and taste, and a social bonding behavior rooted in how dogs interact with vulnerable members of their group. Feet happen to be the most accessible part of a baby, especially one lying on a blanket or in a bouncer, which is why they become the primary target.
Your Baby’s Feet Taste Interesting
Dogs have taste receptors tuned to salt, sour, sweet, and bitter, much like humans do. The salt-detecting area on a dog’s tongue is relatively small compared to other taste zones, but it still picks up on the minerals in human sweat. Baby skin, while it produces less sweat than adult skin, still carries sodium and chloride on its surface. Infant sweat contains sodium concentrations up to about 40 mmol/l, compared to up to 70 mmol/l in adults. That’s lower, but still detectable to a dog’s tongue.
Beyond salt, babies accumulate traces of lotion, milk, food residue, and the general novelty of a new human’s skin chemistry. Feet in particular collect interesting scents from whatever surface the baby has been on. For a dog, licking those feet is like reading a miniature sensory report.
Licking Is a Way Dogs Gather Information
Dogs have a specialized sensory organ in the roof of their mouth called the vomeronasal organ (sometimes called Jacobson’s organ) that processes chemical signals picked up through licking. When your dog licks your baby’s feet, it’s not just tasting. It’s actively sampling the baby’s unique chemical profile, picking up on hormones, skin oils, and other biological signals that tell the dog about this small new creature in the house.
This is the same reason dogs lick your hands after you’ve been cooking or sniff another dog’s face after a walk. Licking is one of their primary tools for understanding the world. A baby, with its unfamiliar and constantly changing body chemistry, is an especially rich source of new information.
Social Bonding and Caregiving Instincts
In canine social groups, licking serves as a grooming and bonding behavior. Mother dogs lick their puppies to clean them, stimulate circulation, and comfort them. When your dog licks your baby, a similar instinct is likely at work. The dog recognizes the baby as a small, vulnerable member of the household and responds with nurturing behavior.
There’s also a submissive component. Dogs often lick to show deference, signaling that they recognize someone’s place in the social group and don’t intend any threat. Licking a baby’s feet, the lowest and most accessible point, fits this pattern. The dog is essentially saying, “I’m not a threat to this small human.”
This interaction also feels good for the dog on a chemical level. A study published in Frontiers in Psychology found that dogs who engaged in physical contact, play, and licking with a person showed a 39% increase in salivary oxytocin, the hormone associated with bonding and social trust. Dogs who spent more time licking and lying near their human partner showed the largest oxytocin increases. So the behavior is literally self-reinforcing: licking your baby makes your dog feel calmer and more connected.
Why Feet Specifically
The simplest explanation is access. Babies spend most of their time lying down, being held, or sitting in carriers. Their feet dangle, stick out from blankets, and are generally the easiest body part for a dog to reach without climbing on top of the baby. Feet are also one of the most scent-rich parts of the human body, with a high density of sweat glands. For a dog looking to investigate a new family member, they’re the obvious starting point.
The ASPCA actually acknowledges this dynamic in their guidelines for introducing dogs to babies. They suggest letting your dog sniff the baby’s feet for a few seconds as an initial, low-risk way to allow interaction, and even note that parents concerned about hygiene can teach their dog to lick a practice doll’s feet only.
Bacteria Risks Worth Knowing About
Dog saliva carries bacteria that are harmless to dogs but can occasionally cause problems for humans. One of the more serious is Capnocytophaga, a bacterium commonly found in the mouths of dogs and cats. According to the CDC, most people who come in contact with dog saliva never get sick from it. But if the bacteria enters the body through a break in the skin, such as a scratch, cut, or open sore, it can cause serious infection including sepsis, meningitis, and kidney failure.
Babies have immature immune systems, which makes them more vulnerable than healthy adults. Intact skin on a baby’s feet is a reasonable barrier, but babies frequently have small scratches, dry skin cracks, or eczema patches that could serve as entry points. The risk of serious infection is low, but it’s not zero.
Managing the Behavior Safely
You don’t necessarily need to stop your dog from ever interacting with your baby, but setting boundaries helps. Let your dog sniff the baby’s feet briefly, then redirect with praise and a command to sit or lie down nearby. This satisfies your dog’s curiosity while keeping contact controlled.
If your baby has any open cuts, rashes, or broken skin on their feet, keep the dog from licking those areas. Wash your baby’s feet with mild soap and water after any licking session. Avoid letting your dog lick your baby’s face, hands, or any area near the mouth, since babies constantly put their hands in their mouths and would ingest whatever bacteria was deposited on their skin.
If your dog’s licking seems compulsive, happening constantly and difficult to interrupt, that can signal anxiety rather than affection. Dogs sometimes lick repetitively as a self-soothing behavior when they’re stressed by changes in the household, and a new baby is one of the biggest changes a dog can experience. In those cases, the licking is less about the baby and more about the dog trying to calm itself down.