Small and toy dogs: the health risks owners often miss

Before going through each fragility one by one, it helps to set one point straight: being small does not automatically mean being fragile in a clinical sense. Many toy and small breeds reach an advanced age with excellent quality of life, and several of the problems covered in this article stay purely theoretical for the whole life of an individual dog. What changes, compared with a medium or large dog, is the threshold of attention: in a small body a slow decline tends to stay hidden longer, because compensating for it is easier, and by the time a sign finally shows up it is often further along than it looks. That is why it helps to watch a handful of key signals regularly, instead of waiting for an acute event.

• A change in gait, or hesitation before jumping on or off the sofa or bed.
• Breath that worsens quickly, or gums that bleed during chewing.
• A dry, honking cough, especially after excitement or on a collar and lead.
• Sudden trembling, weakness or unusual drowsiness in very small puppies.
• Weight gain you can feel over the ribs, even without a scale.
• Behaviour that turns more nervous or reactive than usual around people or other dogs.

Small and toy dogs carry the same number of teeth as a large dog, but the space inside the jaw and skull is much smaller. The result is crowding that traps plaque and tartar in the tight gaps between teeth, and the gum disease that follows often shows up many years earlier than in breeds with roomier mouths. This is not a cosmetic detail: advanced gum disease causes bone loss around the tooth root, chronic pain that is often silent, and in neglected cases can affect organs elsewhere in the body through the bloodstream.

• Breath that changes smell within weeks, not gradually over years.
• A brown or yellowish line along the gum edge of the back teeth.
• Gums that bleed when the dog chews a hard toy or a toothbrush.
• A dog that starts preferring soft food over kibble it used to eat without issue.
• Repeated pawing or rubbing of the muzzle against rugs or furniture.

Three areas deserve particular attention in small dogs, even though they do not affect every breed in the same way. The kneecap can slip out of its natural groove, a condition known as patellar luxation: there are different degrees of severity, from an occasional skip during movement to a gait that is affected all the time, but grading it is always a job for a vet through an orthopaedic examination, not something to judge from the sofa. The skeleton of a toy dog is also proportionally thinner, and a jump that would mean nothing for a medium sized dog can be enough to cause a fracture, especially in the forelimbs of the smallest individuals. Finally, in some lines of very small breeds the fontanelle, the soft opening between the skull bones that normally closes within the first months of life, can stay open longer than expected, and it is something a vet checks at early visits because in some cases it is linked to a risk of hydrocephalus.

A small body has a large surface relative to its own volume, which means it loses heat faster than a large body does under the same conditions. In toy puppies, in very small individuals and in senior dogs, this trait combines with limited energy reserves: a long fast, intense stress or excessive exercise can trigger a drop in blood sugar, hypoglycaemia, which in very small puppies shows up as weakness, trembling, disorientation or unusual drowsiness, outside a puppy's normal lively rhythm.

1. 1

   Small, frequent meals

   Toy puppies need more meals a day than a medium sized puppy, because their energy reserves run out faster.

2. 2

   Watch out for long fasts

   Skipping a meal during a busy day of play or visits should not be dismissed: in a very small puppy the effect shows up sooner.

3. 3

   A warm, sheltered environment

   A bed away from draughts and a heated space during cold months reduce the heat loss that such a small body cannot compensate for on its own.

4. 4

   Weighed portions, not guessed by eye

   Correct amounts for a toy dog are tiny, and an error that seems trivial in grams represents a huge share of the daily ration: weighing the food prevents both underfeeding and overfeeding.

5. 5

   Monitor weight regularly

   A periodic weight check, recorded over time, catches a gain or a loss before it becomes obvious to the eye.

The flip side of metabolic fragility is the opposite risk: precisely because correct portions are tiny, a few extra grams of food a day, or one treat too many handed out generously, translate into a calorie surplus that is proportionally far larger than the same mistake made with a large dog. Being overweight in a small body worsens exactly the fragilities already described, from the joints to the windpipe, so watching the weight is not a cosmetic detail but a direct prevention measure.

Some small breeds show a more marked predisposition to forming stones in the urinary tract compared with the general dog population. The causes vary from case to case, including genetic factors, diet composition and urine concentration, and diagnosing the type of stone always requires laboratory tests and imaging: it is not something you can establish by watching the dog at home. What an owner can do is recognise early the signs of a urinary tract problem, because an obstruction, especially in males, can become an emergency within a matter of hours.

• More frequent urination than usual, often with small amounts of urine each time.
• Visible straining while urinating, with the dog stopping and trying again.
• Blood in the urine, even in barely noticeable traces.
• Persistent licking of the genital area beyond normal grooming.
• A complete absence of urination for many hours, especially in males: treat this as an emergency.

Small size often leads owners to treat a small dog differently from how they would treat a large one: it gets picked up more often, corrected less when it jumps up or barks, carried around like an accessory rather than trained like a dog with real behavioural needs. What ethologists describe as small dog syndrome is not the breed's fault but a matter of handling: a dog that is rarely allowed to walk on its own legs, that receives no consistent rules because it seems harmless even when it growls, more easily develops reactivity, anxiety and controlling behaviour towards people.

• Alternate carrying and walking on paws during outings, instead of carrying the dog for the whole walk.
• Apply the same basic training rules that hold for a dog of any size.
• Avoid managing interactions with other dogs only by picking the dog up to protect it.
• Reward calm behaviour instead of responding only once the dog gets agitated or barks.