Common Dog Behaviors That Leave Owners Scratching Their Heads
Dogs do things that can seem bizarre, gross, or worrying — and the internet is full of confident-sounding explanations that don't always hold up. From chowing down on lawn grass to dragging their hindquarters across your carpet, many of these behaviors have straightforward, well-understood causes that are a far cry from the dramatic explanations often passed around.
This article unpacks the science and veterinary thinking behind several frequently misunderstood dog behaviors. Understanding why dogs do what they do helps you respond appropriately — and recognize the rare cases when a behavior genuinely warrants a vet visit. For a broader look at how dogs communicate through movement and posture, see our practical field guide to dog body language.
Myth
Dogs eat grass because they're sick and instinctively trying to make themselves vomit.
Fact
Most grass-eating dogs show no signs of illness beforehand, and the majority do not vomit afterward.
Research published in the journal Applied Animal Behaviour Science found that fewer than 25% of dogs regularly vomit after eating grass, and less than 10% appeared ill before doing so. Grass-eating is far more likely to reflect simple curiosity, a taste preference, dietary fiber-seeking, or boredom. Some researchers suggest it may be a retained ancestral behavior. Unless grass-eating is frequent and paired with repeated vomiting, it's generally not a cause for alarm — though it's sensible to ensure your lawn isn't treated with pesticides or herbicides.
Myth
Dogs spin in circles before lying down because they're anxious or neurotic.
Fact
Circling before resting is a normal, instinct-driven nesting behavior inherited from wild ancestors.
Wild canids would circle to flatten grass, check for snakes or insects, and orient themselves relative to wind direction before settling down. Domestic dogs retain this pre-sleep ritual even when sleeping on a memory foam bed. An occasional spin or two is entirely normal across breeds and ages. The behavior becomes worth mentioning to a vet only if it turns into compulsive, prolonged circling that the dog seems unable to interrupt — which can occasionally indicate orthopedic discomfort or, in senior dogs, cognitive changes.
Myth
If your dog is scooting across the floor, it definitely has worms.
Fact
Scooting most commonly signals anal gland discomfort, not intestinal parasites.
Dogs have two small scent glands on either side of the anus that can become impacted, infected, or overfull. When they're uncomfortable, scooting is the dog's way of trying to relieve the pressure. While intestinal parasites can cause rear-end itching, they are a less common cause of scooting than anal gland issues. Allergies and skin irritation in the perineal area are also frequent culprits. A veterinarian can examine and express the anal glands if needed, and recommend appropriate parasite screening if that's suspected. Regular grooming and a high-fiber diet can help some dogs maintain healthy gland function. For related oral health context, see our piece on overlooked aspects of dog dental health.
Myth
Dogs eat feces (coprophagia) because they're missing a specific nutrient.
Fact
Coprophagia has multiple contributing causes; nutritional deficiency is one possibility but far from the only one.
Puppies commonly explore the world orally and may eat feces out of curiosity — most grow out of it. In adult dogs, the behavior can stem from attention-seeking, boredom, stress, a learned habit, or in some cases an underlying gastrointestinal issue affecting nutrient absorption. Nutritional deficiency is less commonly the cause than owners assume, especially in dogs eating a complete commercial diet. A veterinarian can help rule out medical causes and suggest behavior-modification strategies. Punishing the behavior tends to make it worse, as dogs may simply learn to do it more quickly or out of sight.
Myth
A dog that licks its paws obsessively just has a bad habit or is bored.
Fact
Persistent paw licking is frequently a sign of environmental or food allergies, or localized pain.
Occasional paw grooming is normal. But a dog that licks or chews at its paws until the fur is rust-stained or the skin is raw is communicating discomfort. Atopic dermatitis (environmental allergies) is one of the most common causes, often triggered by grass, pollen, or dust mites — the same things that give humans hay fever. Food sensitivities, contact irritants (like sidewalk salt in winter), interdigital cysts, or a foreign body lodged between the toes are other possibilities. Understanding behavioral signals alongside physical cues is part of reading your dog holistically; our guide to reading your dog's body language covers posture and stress signals in depth.
When Should a Behavior Actually Concern You?
Most of the behaviors covered here are normal expressions of canine biology and instinct. The key distinction veterinarians draw is between occasional, low-intensity behavior and behavior that is sudden, compulsive, or escalating.
If your dog has always nibbled grass now and then, that's very different from a dog that suddenly can't stop eating it and is vomiting repeatedly. Similarly, a dog that scoots once after a grooming appointment is not the same as a dog scooting daily and licking persistently at its hindquarters. Compulsive circling, especially in older dogs, can sometimes point to neurological or cognitive changes worth discussing with your veterinarian.
Compulsive Behaviors Are Different From Quirky Ones
There's a meaningful distinction between a dog that occasionally spins before napping and one that circles relentlessly or snaps at invisible flies. Compulsive behaviors — those the dog cannot easily interrupt and that interfere with normal activities — can indicate anxiety disorders or underlying medical issues. A veterinarian or a board-certified veterinary behaviorist is the right resource, not online reassurance alone.
Dogs rarely show pain the way humans expect. If any behavior shifts dramatically in frequency or seems paired with restlessness, appetite changes, or lethargy, it's worth a professional look. Our related article on signs of pain dogs frequently hide outlines what to watch for.
This article is for general informational purposes only and is not a substitute for professional veterinary advice. Always consult a licensed veterinarian for concerns about your dog's health or behavior.
