What exactly is happening inside a puppy's mouth when a cleft palate is present?

The palate is the bony and soft tissue structure that forms the roof of the mouth and separates the oral cavity from the nasal cavity above it. During normal fetal development, two shelves of tissue grow toward the midline and fuse together; when that fusion fails to complete, a gap remains connecting the mouth directly to the nose. According to the Merck Veterinary Manual, this opening can involve just the soft palate at the back of the throat, the hard bony palate toward the front, or both, and can range from a few millimeters to a defect running the entire length of the roof of the mouth (Merck Veterinary Manual, 2023).

Because the mouth and nasal cavity are no longer separated, anything a puppy swallows, milk, water, food, or saliva, has a direct route into the nasal passages and potentially down into the airway and lungs. The American College of Veterinary Surgeons notes that cleft palate is among the more frequently diagnosed congenital defects in small-animal practice and is often identified in the first physical exam a veterinarian performs on a newborn litter (American College of Veterinary Surgeons, n.d.).

What do owners and breeders usually notice first in an affected puppy?

The earliest and most reliable sign is milk coming out of the puppy's nostrils during or right after nursing, since suckling requires the puppy to generate negative pressure in a sealed oral cavity, something a cleft palate prevents. Breeders often also notice a puppy who nurses weakly, tires quickly, cries during feeding, or simply fails to gain weight at the same rate as littermates in the first one to two weeks of life (Merck Veterinary Manual, 2023).

Coughing, gagging, or a wet, congested sound to the breathing are common secondary signs, since milk and food that enter the nasal passages irritate the tissue and can be aspirated into the lower airway. A puppy that develops nasal discharge, sneezing, or a persistent cough in the first weeks of life should be examined for an oral defect rather than assumed to have a simple upper respiratory infection.

Why do some puppies develop a cleft palate and are certain breeds more likely to have it?

Most cases are congenital, meaning the puppy is born with the defect due to incomplete fusion of the palatal shelves during gestation. The Merck Veterinary Manual reports that cleft palate affects roughly 3% of purebred puppies, though the rate appears higher in certain brachycephalic and small breeds such as Boston Terriers, Bulldogs, Pekingese, and Boxers, suggesting a genetic component tied to skull and facial conformation (Merck Veterinary Manual, 2023).

Nutritional deficiencies in the pregnant dam, exposure to certain toxins or medications during pregnancy, and viral infections have all been suggested as contributing factors in some litters, though a specific cause often cannot be pinned down in an individual case. Cleft palate can also be acquired later in life rather than present at birth, most often from blunt trauma such as a fall or being hit by a car, from electrical cord burns in puppies that chew through cords, or from untreated severe dental disease that erodes through the palate (Merck Veterinary Manual, 2023).

How does a veterinarian confirm a cleft palate and rule out how far it extends?

A visible gap along the midline of the mouth is often enough for an initial diagnosis during a hands-on oral exam, and many cases are caught within the first day of life during routine neonatal checks. However, because the soft palate sits toward the back of the throat, fully characterizing a defect, especially a soft palate cleft that isn't visible with the mouth held open, usually requires sedation or general anesthesia so the veterinarian can examine the full length of the palate and probe its extent (American College of Veterinary Surgeons, n.d.).

Veterinarians will also assess the puppy for signs of aspiration pneumonia, including listening to the lungs and, if there's concern, obtaining chest radiographs, since puppies with cleft palate are prone to inhaling milk or food into the airway before the defect is repaired. Bloodwork and a general physical assessment help determine whether the puppy is stable enough for anesthesia or needs stabilization first.

Can a cleft palate be fixed, and what does the surgery involve?

Surgical closure is the only definitive treatment, and it typically involves repositioning and suturing local tissue flaps to close the gap between the oral and nasal cavities. Most surgeons prefer to wait until a puppy is at least 8 to 12 weeks old and has enough tissue and body weight to tolerate anesthesia and support the repair, though puppies with a mild defect and no complications may sometimes be monitored a bit longer before surgery (Merck Veterinary Manual, 2023).

Wide or severe clefts often require more than one surgery to fully close, and the American College of Veterinary Surgeons notes that some degree of tissue breakdown or incomplete healing at the surgical site is common enough that owners should be counseled about the possibility of a second procedure (American College of Veterinary Surgeons, n.d.). Until surgery is performed, feeding tubes, such as an esophagostomy tube, are frequently used to deliver nutrition directly to the stomach and avoid further aspiration.

How should a family feed and care for a puppy with an unrepaired cleft palate?

Puppies with a confirmed cleft palate generally cannot nurse safely and need an alternative feeding method until surgery can be performed, most commonly tube feeding directly into the esophagus or stomach, which bypasses the mouth and nasal passages entirely. Feeding by bottle or syringe is typically avoided in moderate to severe cases because it still risks pushing milk up into the nasal cavity and down into the lungs.

Close monitoring for signs of aspiration pneumonia, including coughing, nasal discharge, lethargy, or reduced appetite, is essential during this period, and any of these signs warrants an immediate veterinary recheck. Keeping the puppy warm, tracking daily weight gain, and following the veterinarian's specific feeding volume and frequency schedule all help the puppy stay strong enough to reach a safe surgical age.

What is the long-term outlook for a dog after cleft palate repair, and should the dog be used for breeding?

Dogs whose defect is successfully repaired generally go on to eat, drink, and breathe normally, and most families report a good long-term quality of life once healing is complete. Outcomes are generally best when the defect is smaller, the puppy is stable heading into surgery, and follow-up care catches any incomplete healing early enough for a second procedure if needed (Merck Veterinary Manual, 2023).

Because congenital cleft palate has a suspected hereditary component in several breeds, veterinary organizations recommend that affected dogs, along with their parents and littermates from an affected litter, not be used for future breeding, and that affected dogs be spayed or neutered once they're old enough for the procedure (American College of Veterinary Surgeons, n.d.).