In recent days, the so-called "werewolf syndrome" has been discovered in dogs, leading to a comprehensive recall of various dog food products. This syndrome manifests itself through serious neurological abnormalities that can be fatal for affected animals.

Symptoms of werewolf syndrome in dogs:

• Sudden panic attacks
• Uncontrolled movements
• Howling
• Epileptic seizures

In this context, the Dutch Food and Consumer Product Safety Authority (NVWA) has issued a warning about certain Barkoo brand dog chew bones, which were also sold in Germany. Affected products These include:

• Barkoo knotted chew bones (pigskin): 100 % pigskin provides long-lasting chewing fun, available in various sizes. Zooplus
• Barkoo pressed chew bones (cowhide): The popular snack made from pressed beef hide, also available with a delicious filling. Zooplus
• Barkoo chew rolls, twisted (cowhide): Twisted dog chew made from dried beef hide, approx. 12.5 cm long, Ø 1 cm. Zooplus

Specific chew toys that are currently being warned against because they can trigger werewolf syndrome:

Barkoo cheese, natural variety, 29 cm

• Packaging: Bag of 570 grams (containing 3 chew bones)
• Code on the packaging (see photo): 1148655 Best before 04.2027 3200PF027
• Barcode: 4260077047292

Barkoo chew bone, knotted, natural, 11 cm

• Packaging: Bag of 150 grams (containing 3 chew bones)
• Code on the packaging (see example photo above): 1148592 Best before 07.2027 3200PF027
• Barcode: 4260077046875 

Barkoo chewing bone knotted 24cm

• Packaging: Bag of 150 grams (containing 3 chew bones)
• Barcode: 4260077046899
• Code on the packaging (see photo): 1148657 Best before 05.2027 3200PF027

Barkoo knotted chew bone with spirulina, 12cm

• Packaging: Bag of 180 grams (containing 3 chew bones)
• Barcode: 4260077047261
• Code on the packaging (see photo): 1148654 Best before 06.2027 3200PF027

These products were sold through the online shop Zooplus. Customers who have purchased these chew bones are strongly advised not to feed them to their pets and to contact the respective shop for further information.

In parallel, they also Danish authorities have warned about six products from the brand Chrisco A/S, which were sold nationwide. Consumers reported similar symptoms in their dogs, including sudden and extreme excitement, panic attacks, howling, barking, restlessness, aggression, salivation, and seizures.

Chrisco Chicken Chew Rolls, 10 pieces

Article number: 12457
EAN code: 5764630124578
Usability data: All data

Chrisco Chew Rolls with Chicken & Chicken Liver, 100 g

Article number: 12324
EAN code: 5764630123243
Usability data: 01.12.2025; 05.01.2026; 15.03.2026; 18.03.2026; 15.04.2026; 20.04.2026; 01.06.2026; 15.07.2026

Chrisco Chew Rolls, 18 pieces – white

Article number: 12468
EAN code: 5764630124684
Usability data: 05.01.2027; 26.02.2027; 15.03.2027; 18.03.2027; 24.03.2027

Chrisco Massive Police Batons, 2 pieces – brown

Article number: 12541
EAN code: 5764630125414
Usability data: 26.02.2027; 15.04.2027

Chrisco Massive Police Batons, 2 pieces – white

Article number: 12542
EAN code: 5764630125421
Usability data: 05.01.2027; 20.04.2027; 01.06.2027

Chrisco Chew Rolls with Chicken & Chicken Liver, 1 piece

Article number: 12624
EAN code: 5764630126244
Usability data: 01.12.2025; 05.01.2026; 15.03.2026; 18.08.2026

Dog owners are strongly urged to stop using the affected products and either dispose of them or return them to the store where they were purchased. Further information and a complete list of affected products can be found on the websites of the relevant authorities and manufacturers.

For questions or further information, please contact the customer service pages of the respective providers:

https://support.zooplus.de/de/support

https://www.chrisco.dk/contact?utm_source=chatgpt.com

This unfortunately confirms our findings in the article from December 6, 2024, on the topic of „Toxic dog chew bones.“

What is werewolf syndrome?

The Werewolf Syndrome is a neurological disorder currently observed in dogs in Germany, characterized by sudden panic attacks, uncontrolled movements, epileptic seizures, and yelping. Affected dogs appear "changed," hence the name. Werewolf Syndrome has inspired. The University of Veterinary Medicine Hannover (TiHo) Foundation, together with other institutions, is investigating the causes of the Werewolf syndrome, as it occurs more frequently in households with multiple dogs. Initial indications suggest that the Werewolf Syndrome It may possibly be related to the feeding of beef hide bones, but this has not yet been scientifically confirmed.

A study by the University of Veterinary Medicine Hannover (TiHo) is asking dog owners for their help to learn more about the... Werewolf Syndrome to learn more and identify risk factors. The survey is aimed at owners of both affected and unaffected dogs. The goal is to gain more knowledge about the condition through data analysis. Werewolf Syndrome to learn and develop preventative measures. Owners of affected animals are urged to have their dogs examined neurologically, as the Werewolf Syndrome which can have serious consequences for the animals' quality of life.

Besides the University of Veterinary Medicine Hannover (TiHo), the Hofheim Animal Clinic also offers specialized examinations for neurological diseases; however, no specific studies on this topic have been conducted there so far. Werewolf Syndrome known. Due to the uncertainties surrounding the causes and treatment options, the Werewolf Syndrome a pressing area of research. By comparing the living and feeding conditions of affected and healthy dogs, scientists hope to... Werewolf Syndrome to better understand and find solutions. Werewolf Syndrome This demonstrates the importance of a comprehensive scientific investigation in the case of newly emerging diseases.