Disease Description: A condition where the suture lines between bones of the skull do not fuse together properly.

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Disease Symptom: The main symptom of an open fontanel is a soft spot or hole in the skull that remains into adulthood in a dog. For many dogs, these open fontanelles will cause no problems, but can result in injuries if subject to trauma. For other dogs, open fontanelles can be a sign of a bigger problem, such as hydrocephalus. Signs your dog may be experiencing this condition can include: Presence of soft spots or holes in skull, usually located on the top of the head Round, domed, or apple-shaped skull Eyes directed downwards or upwards Head pressing Difficulties with housetraining Puppies slow to grow Restlessness Aimless wandering Lack of coordination Blindness Seizures

Disease Cause: Open fontanelles are often a congenital defect, but it can be an acquired condition due to a problem that puts pressure on the skull and cause it to be unable to fuse completely. Reasons for open fontanelles to occur include: Genetic defect Hydrocephalus Swelling or infection of the brain Brain tumor Disease process that blocks cerebrospinal fluid drainage Breeds commonly affected with open fontanelles include many toy breeds and short faced, or brachycephalic breeds, such as: Chihuahuas Miniature Dachshunds Pomeranians Shih Tzus Yorkshire Terriers Maltese English Bulldogs Lhasa Apsos Boston Terriers Cairn Terriers Pugs Pekingese Toy Poodles

Disease Diagnose: If you’ve noticed a domed or apple-shaped appearance to your dog’s skull, or have felt soft spots past puppyhood, you should talk with your veterinarian. The sooner you seek medical advice, the better it may be for your dog. Be sure to inform your vet about any symptoms you may have seen. Your veterinarian will examine your dog and ask questions about any behavioral or neurological abnormalities. Imaging techniques can show the presence of an open fontanel, fluid accumulation, tumors, or other abnormalities, and can include X-rays, ultrasounds, CT scans or MRIs. Results from these tests can confirm the presence of an open fontanel, as well as a condition such as hydrocephalus.

Treat Method: For some dogs, the presence of an open fontanel requires no treatment, but may necessitate some special handling. Often, these dogs are adopted into families without other animals or even children, with instructions to avoid any traumas to the head. While it may resolve in puppies, an open fontanel will remain with an adult dog throughout his entire life. For those dogs who have associated or concurrent problems, such as hydrocephalus, treatment is usually needed. Medications If caught early, hydrocephalus is treated with medication to reduce both brain inflammation, such as with corticosteroids, and the amount of cerebrospinal fluid produced, often with omeprazole. More severe cases may also need anti-seizure medications, diuretics to reduce fluid production, and electrolytes. Surgery For a more permanent solution, a ventriculoperitoneal shunt can be placed. This is a small tube surgically implanted into a ventricle of the brain to take the excess cerebrospinal fluid and safely drain it to another part of the body. As your dog grows, additional surgeries are often required to re-fit the shunt. Complications of this procedure include infections, and over or under drainage. The success rate for a shunt is approximately 80%. While this procedure can help a case of hydrocephalus from worsening, it does not resolve the open fontanel itself.

Breeder Advice: Recovery of an open fontanel in your dog will depend on the severity of his condition. If your dog has an open fontanel, but no other medical issues, then he can live a long and healthy life, so long as he receives no direct trauma to that area. If your dog’s condition is more severe, with associated hydrocephalus, treatment can help to resolve symptoms. While symptoms in some dogs may resolve in two years, other cases may need repeated treatments of medications or surgery to place or re-fit a shunt. You may need to administer medications or postoperative care to your dog at home, and ensure a safe and trauma free environment throughout his lifetime. Prevent open fontanelles and hydrocephalus in future generations by refraining from breeding affected dogs. If you have a breed of dog which is known for these conditions, monitor your puppy’s growth and seek advice from your veterinarian if you notice any of the associated symptoms.

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