In recent days, the so-called "werewolf syndrome" has been discovered in dogs, which has led to a comprehensive recall of various dog food products. This syndrome is characterized by severe neurological abnormalities that can be fatal for affected animals.

Symptoms of Werewolf Syndrome in Dogs:

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

In this context, the Dutch Food Safety Authority (NVWA) has warned against certain dog chewing bones from the Barkoo brand, which were also sold in Germany. Affected products include:

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

Specific chews that are currently being warned can trigger werewolf syndrome:

Barkoo cheese type natural 29 cm

• Packaging: Bag of 570 grams (with 3 chewing 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 (with 3 chewing 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 (with 3 chewing bones)
• Barcode: 4260077046899
• Code on the packaging (see photo): 1148657 MHD05.2027 3200PF027

Barkoo chewing bone knotted with spirulina 12cm

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

These products were sold via the online shop Zooplus. Customers who have purchased these chewing bones are strongly advised to stop feeding them and to contact the store for further information.

At the same time, Danish authorities have also warned about six Chrisco A/S brand products that were sold nationwide. Consumers here reported similar symptoms in their dogs, including sudden and extreme agitation, panic attacks, howling, barking, restlessness, aggression, salivation and convulsions.

Chrisco Chew Rolls with Chicken, 10 pieces

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

Chrisco chew rolls with chicken & chicken liver, 100 g

Item number: 12324
EAN code: 5764630123243
Usability dates: December 1st, 2025; January 5, 2026; March 15, 2026; March 18, 2026; April 15, 2026; April 20, 2026; June 1, 2026; July 15, 2026

Chrisco chew rolls, 18 pieces - white

Item number: 12468
EAN code: 5764630124684
Usability dates: January 5, 2027; February 26, 2027; March 15, 2027; March 18, 2027; March 24, 2027

Chrisco Massive police batons, 2 pieces - brown

Item number: 12541
EAN code: 5764630125414
Usability dates: February 26, 2027; April 15, 2027

Chrisco Massive police batons, 2 pieces - white

Item number: 12542
EAN code: 5764630125421
Usability dates: January 5, 2027; April 20, 2027; June 1, 2027

Chrisco Chew Rolls with Chicken & Chicken Liver, 1 piece

Item number: 12624
EAN code: 5764630126244
Usability dates: December 1st, 2025; January 5, 2026; March 15, 2026; Aug 18, 2026

Dog owners are urged to stop using affected products and to 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.

If you have any questions or further information, you can 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 article from December 6th, 2024 on the topic of “ Chewing bones containing toxic substances for dogs .”

What is Werewolf Syndrome?

Werewolf syndrome is a neurological disease in dogs currently observed in Germany that is characterized by sudden panic attacks, uncontrolled movements, epileptic seizures and howling. Affected dogs appear “changed,” which inspired werewolf syndrome The Hannover Veterinary University Foundation (TiHo) is working with other institutions to investigate the causes of werewolf syndrome , as it often occurs in households with several dogs. Initial evidence suggests that werewolf syndrome may be related to feeding on bovine hide bones, but this has not yet been scientifically confirmed.

A study by TiHo is asking dog owners to help them learn more about werewolf syndrome and identify risk factors. The survey is aimed at owners of both affected and unaffected dogs. werewolf syndrome by analyzing data and develop prevention measures. Owners of affected animals are urged to have their dogs neurologically examined, as werewolf syndrome can have serious effects on the animals' quality of life.

In addition to the TiHo, the Hofheim Animal Clinic also offers specialized examinations for neurological diseases, but there are currently no specific studies on werewolf syndrome known there. Because of the lack of clarity about its causes and treatment options, werewolf syndrome an urgent area of ​​research. By comparing the living and feeding conditions of affected and healthy dogs, scientists hope to werewolf syndrome and find solutions. The werewolf syndrome shows how important a comprehensive scientific investigation is in the case of newly occurring diseases.