Feature photo by Bob Segal
By Dr Nerissa Hannink, University of Melbourne
As pet ownership increases across the world, our furry (as well as feathered and scaly) friends have become firmly established members of the family.
Wanting the best for our pets, we often offer special treats, and chicken necks are a favourite in many families – often considered a ‘healthy’ option.
But vets are warning raw chicken, particularly chicken necks, can lead to a debilitating and potentially fatal form of paralysis in dogs.
A new study, led by the University of Melbourne’s U-Vet Werribee Animal Hospital, found the consumption of raw chicken meat increases the risk of dogs developing a paralysing condition called acute polyradiculoneuritis (APN) by more than 70 times.
Dr Matthias le Chevoir, chief investigator on the project, says the cause of APN in dogs has baffled the veterinary community for a long time.
“It is a rare but very debilitating condition where the dog’s hind legs first become weak. It can then progress to affect the front legs, neck, head and face. Some dogs may die from the disease if their chest becomes paralysed,” he says.
“Most dogs eventually recover without treatment but it may take up to six months or more in some cases.
“In our clinic alone we see around 30 cases per year and around three in ten cases would not recover. Watching your pet suffer is obviously very distressing and it can be difficult for owners to nurse their pet if the condition can gradually improve.”
Paralysis results from the dog’s immune system becoming unregulated and attacking its own nerve roots, progressively worsening over several days.
APN is the canine counterpart of Guillain-Barré syndrome (GBS) in humans, a condition that also causes muscle weakness and may require ventilation if chest muscles are affected.
Dr le Chevoir says the bacteria Campylobacter is now considered a triggering agent in up to 40 per cent of GBS patients. It may be present in undercooked chicken, unpasteurised milk products and contaminated water.
“Our team at U-Vet Animal Hospital wanted to understand if consuming raw chicken could also be triggering APN in dogs. Many of us have previously worked overseas and know that a raw meat diet is less common there, so we were intrigued by this potential connection,” Dr le Chevoir says.
The team studied 27 dogs with symptoms of APN and 47 dogs without, examining physical symptoms and interviewing the owners about recent behaviours and diet; focusing on the consumption of raw chicken meat.
Faecal samples collected within seven days of the presentation of clinical signs (such as changes in voice, hind limb weakness or a choppy gait) showed the dogs with APN were 9.4 times more likely to have had a Campylobacter infection than the control group without the disease.
“The microbe Campylobacter is likely to be the reason for the dysregulation of the dogs’ immunity and the symptoms of paralysis,” lead author Dr Lorena Martinez-Antòn says.
“These bacteriological results were consistent with the hypothesis that the uncooked chicken meat was the source of the Campylobacter and as a result, triggered APN.”
In humans, scientists think Campylobacter, which is most commonly found in commercial poultry products, contains molecules similar in structure to part of the nerve cell. This similarity confuses the immune system, which attacks the body’s own nerves, resulting in paralysis.
Dr Martinez-Antòn and Dr le Chevoir say there appears to be a growing trend for feeding dogs raw meat diets, which is concerning given the risks.
“A significant association is also found between APN and smaller dog breeds. Based on our clinical experience this seems to be because smaller dogs are more likely to be fed smaller bones like chicken necks,” the doctors say in the research paper.
“We recommend owners choose regular dog food rather than chicken necks until we know more about this debilitating condition.”
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