Most dogs will, at some point, run into one of a handful of common health issues — dental disease, weight problems, itchy skin, an ear infection, a bout of parasites. Knowing what they look like helps you act early and ask better questions at the vet. This is a plain-English, non-diagnostic overview to help you recognize patterns — not a manual for treating anything at home.
First: the red flags that mean act now
Before the everyday issues, learn the signs that can’t wait. If you see any of the following, don’t “watch and see” — call a veterinarian or emergency clinic immediately:
- Bloat (GDV): a swollen, hard belly with unproductive retching, drooling and distress — a life-threatening emergency, especially in deep-chested breeds.
- Inability to urinate or repeated straining with little or no output — a urinary blockage can become fatal quickly.
- Collapse, extreme weakness, or pale/blue gums.
- Severe difficulty breathing, choking or non-stop gasping.
- Seizures, especially repeated or prolonged ones.
- Uncontrolled bleeding or a major trauma (hit by a car, a bad fall, a serious bite).
- Suspected poisoning — chocolate, xylitol, grapes/raisins, medications, rodenticides, antifreeze and many plants are toxic to dogs.
Dental disease
Dental disease is one of the most common conditions in adult dogs, and it’s easy to overlook because it builds quietly. Plaque hardens into tartar, gums become inflamed, and over time this can affect comfort and overall health. Signs owners notice include bad breath, yellow-brown buildup on the teeth, red or bleeding gums, and reluctance to chew. Daily tooth brushing and routine professional cleanings, as your vet recommends, are the backbone of prevention. Persistent bad breath is worth a vet visit — it’s not just “dog breath.”
Obesity & weight
Carrying extra weight is extremely common and quietly serious — it strains joints, taxes the heart, and is linked to other health problems. The trouble is that “normal” has crept upward, so many owners don’t realize their dog is overweight. A healthy dog generally has a visible waist when viewed from above and ribs you can feel without pressing hard. If you’re not sure, your vet can score body condition and set a plan. The two levers are diet and activity — pair our dog feeding guide with the right routine from dog exercise needs by breed.
Ear infections
Ear infections are a frequent reason for vet visits, especially in dogs with floppy ears, lots of ear hair, or underlying allergies. Watch for head shaking, scratching at the ears, redness, odor, or discharge. Ears are delicate — resist the urge to dig in with cotton swabs or home remedies, which can push debris deeper or cause harm. A vet can look inside, identify the cause (yeast, bacteria, mites or allergy-driven), and guide proper care.
Parasites: fleas, ticks & worms
Parasites are common and largely preventable. Fleas cause itching and can trigger allergic skin reactions; ticks can transmit serious diseases; and worms — including heartworm, which is spread by mosquitoes and can be life-threatening — affect dogs across much of the country. The AVMA stresses year-round prevention as the cornerstone here. Signs can include scratching, visible fleas or “flea dirt,” scooting, a dull coat, or worms in the stool, but many infections show no obvious signs early. Talk to your vet about the right preventives for your area and keep them current.
Allergies & skin issues
Itchy, irritated skin is one of the most common complaints owners bring to the vet. Allergies — to fleas, environmental triggers like pollen, or certain foods — often show up as scratching, licking (especially paws), recurrent ear or skin infections, hair loss or hot spots. Skin problems are notoriously tricky to pin down because so many causes overlap. Rather than guessing with over-the-counter products, a vet can help identify the trigger and a management plan; chronic itching is genuinely miserable for a dog and worth addressing.
Arthritis in senior dogs
As dogs age, joint wear is common, and arthritis can quietly reduce a dog’s quality of life. The signs are subtle at first: slowing on walks, stiffness after rest, hesitation on stairs, difficulty rising, or reluctance to jump. Many owners chalk it up to “just getting old” — but discomfort can often be managed to keep a senior comfortable and mobile. Keep aging dogs lean (extra weight worsens joint stress), provide soft bedding and traction on slick floors, and ask your vet about appropriate options for your dog.
Digestive (GI) upset
Occasional mild vomiting or diarrhea is common — dogs eat things they shouldn’t. Often a single episode in an otherwise bright, energetic dog resolves on its own. But GI upset needs a vet when it’s severe, persistent (more than a day or so), bloody, or paired with lethargy, a painful belly, or signs of dehydration — and urgently if you suspect a swallowed object, a toxin, or bloat. Puppies, seniors and small breeds can dehydrate faster, so err toward calling sooner. Avoid the temptation to reach for human medications, many of which are dangerous to dogs.
Reading the early warning signs
You know your dog’s normal better than anyone, and changes from baseline are your best early-warning system. Worth a vet conversation: appetite or thirst changes, new lethargy, limping, persistent bad breath, lumps, coughing, changes in urination or stool, or any “off” behavior that lingers. Behavioral shifts can signal pain too — a normally friendly dog that suddenly snaps when touched may be hurting, which is one reason learning dog body language matters for health, not just training.
Frequently Asked Questions
What are the most common health problems in dogs?
Among the most frequently seen are dental disease, obesity, ear infections, parasites (fleas, ticks, worms), skin allergies, arthritis in older dogs, and bouts of digestive upset. Many are preventable or manageable with routine care. This is general education, not a diagnosis — your vet should assess any specific concern.
How do I know if my dog’s problem is an emergency?
Treat it as an emergency and contact a vet immediately for a bloated, distended belly with unproductive retching, an inability to urinate, collapse, severe breathing trouble, seizures, uncontrolled bleeding, or any suspected poisoning. When in doubt, call — it’s always better to be cautious.
What number do I call if my dog ate something toxic?
In the U.S., reach the ASPCA Animal Poison Control Center at (888) 426-4435, available 24/7 (a consultation fee may apply), and contact your own vet or nearest emergency clinic right away. Don’t induce vomiting unless a professional tells you to.
Can I prevent most of these problems?
Many of them, yes — year-round parasite prevention, dental care, a healthy weight, routine wellness visits and current vaccinations go a long way. The AVMA and AAHA emphasize that preventive care catches problems early, when they’re easier to manage.
Sources
- AVMA — Pet Owner Resources & Preventive Care
- AAHA (American Animal Hospital Association) — Pet Owner Education
- ASPCA — Animal Poison Control Center: (888) 426-4435