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Reading: Warning as common chew toy alleged to give dogs ‘werewolf syndrome’ – with 13 canines dead
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Need To Know > News > Animals > Warning as common chew toy alleged to give dogs ‘werewolf syndrome’ – with 13 canines dead
Pet owners warned after Barkoo chew toys linked to ‘werewolf syndrome,’ causing neurological issues in dogs, with 15 fatalities reported across multiple countries.
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Warning as common chew toy alleged to give dogs ‘werewolf syndrome’ – with 13 canines dead

Katie Dollard
Last updated: January 9, 2025 5:05 pm
Katie Dollard Published January 9, 2025
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One of the Barkoo chew bones. (Picture: Jam Press)
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Pet owners have been warned after a common chew toy is alleged to have caused ‘werewolf syndrome’.

Nearly 50 dogs have fallen seriously ill – of which 15 have died at the time of writing – with cases reported in several countries.

A Dutch health authority has warned that the product, which can be purchased online, can cause the sickness.

READ MORE: Beloved dog who almost drowned in sea reunited with hero lifeboat crew who gave her kiss of life

The so-called ‘werewolf syndrome’ is often illustrated by panic attacks, extreme amounts of energy, aggression and canines howling like a wolf, as reported by Need To Know.

Pet owners warned after Barkoo chew toys linked to ‘werewolf syndrome,’ causing neurological issues in dogs, with 15 fatalities reported across multiple countries.
A stock image of a dog. (Picture: Jam Press)

Several dog owners who claim to have purchased the Barkoo chew toy online say the neurological symptoms appeared soon after use.

In one case, in Groningen, Netherlands, one dog reportedly died while its brother was taken to a veterinary hospital.

Vets claimed that the toy item was to blame.

The Netherlands Food and Consumer Product Safety Authority, NVWA, has now issued an official warning for Barkoo chew bones, which is sold by websites such as Zooplus and Bitiba.

Pet owners warned after Barkoo chew toys linked to ‘werewolf syndrome,’ causing neurological issues in dogs, with 15 fatalities reported across multiple countries.
Information on the packaging of the Barkoo chew bones. (Picture: Jam Press)

“These chew bones are the suspected cause of the development of serious neurological abnormalities in dogs,” they announced in a statement.

“This is currently still being investigated.

“These neurological abnormalities are also described as werewolf syndrome.

“This syndrome can lead to death.”

Nina Meyerhoff, a veterinarian in Hanover, told the German magazine GMX: “It seems as if the dogs are hallucinating.

Pet owners warned after Barkoo chew toys linked to ‘werewolf syndrome,’ causing neurological issues in dogs, with 15 fatalities reported across multiple countries.
Information on the packaging of the Barkoo chew bones. (Picture: Jam Press)

“Some try to jump out of the window or suddenly become aggressive.”

Cases have also been reported in Switzerland, Finland and Belgium.

Jam Press has contacted Barkoo, Zooplus and Bitiba for comment.

READ MORE: Pregnant snake spills dozens of baby anacondas onto road after being run over

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