Precautionary advice issued to pet owners on dog chews linked to illness

The affected products include: 

Barkoo kaustange natur 29 cm 

Packaging: bags of 570 grams (with 3 chewing bones) 

Code on packaging (see photo): 1148655 MHD 04.2027 3200PF027 

Barcode: 4260077047292 

 

Barkoo kauknochen, geknotet natur 11cm 

Packaging: bags of 150 grams (with 3 chewing bones) 

Code on packaging (see photo): 1148592 MHD 07.2027 3200PF027 

Barcode: 4260077046875  

 

Barkoo Kauknochen geknotet 24cm 

Packaging: bags of 150 grams (with 3 chewing bones) 

Barcode: 4260077046899 

Code on packaging (see photo): 1148657 MHD05.2027 3200PF027 

 

 Barkoo Kauknochen geknotet mit Spirulina 12cm

Packaging: bags of 180 grams (with 3 chewing bones) 

Barcode: 4260077047261 

Code on packaging (see photo): 1148654 MHD 06.2027 3200PF027 

Chrisco Products: 

Chrisco Tyggeruller med kylling, 10 stk (No image available) 

Item number: 12457 

EAN code: 5764630124578 

Use by dates: all dates 

Chrisco Tyggeruller med kylling & kyllingelever, 100g (No image available) 

Product no. 12324 

EAN code: 5764630123243 

Use by dates: 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 Tyggeruller 18 stk. - hvide (No image available) 

Product no. 12468 

EAN code: 5764630124684 

Use by dates: 05/01/2027; 26-02-2027; 15-03-2027; 18-03-2027; 24-03-202 

Chrisco Massive politistave, 2.stk. - brune (No image available)           

Product no. 12541 

EAN code: 5764630125414 

Use by dates: 26/02/2027; 15-04-2027 

Chrisco Massive politistave, 2stk. - hvide (No image available)       

Product no. 12542 

EAN code: 5764630125421 

Use by dates: 05/01/2027; 20-04-2027; 01-06-2027 

Chrisco Tyggerulle m. kylling & kyllingelever, 1stk  (No image available)     

Product no. 12624 

EAN code: 5764630126244 

Use by dates: 01/12/2025; 05-01-2026; 15-03-2026; 18-08-2026 

Reports from the EU suggest that these products are potentially linked to dogs experiencing what is known as ‘werewolf syndrome’. Symptoms include panic attacks, aggression, spasms, epileptic fits and in some cases death.  There is no confirmed distribution of the chews to the UK and no cases have been detected in the UK. 

‘While there is no confirmed distribution of affected products to the UK, there is the possibility that some consumers may have purchased these online from international sellers. No unsafe dog chews have been identified but, based on international investigations so far, we are advising dog owners to avoid feeding the affected chews to dogs as a precaution. There is no evidence to suggest these products present any risk to human health.’ 

Tina Potter, Head of Incidents, Food Standards Agency

The FSA has been liaising with authorities in affected EU countries to gain more understanding of the issue.

Advice for dog owners 

If you have fed the affected chews to your dog, stop doing so immediately.  

If your dog is unwell and has been fed any of the dog chews listed, you should seek veterinary advice and provide detailed information to the vet about the foods and treats your dog has been fed. 

Advice for vets  

Vets should be alert to symptoms in dogs presenting at their surgeries and whether they may be associated with the consumption of the chews, which have a long shelf life and may have been bought several months ago.  

Relevant symptoms include:  

• sudden behavioural changes such as howling, crying, aggression 
• epileptic-type seizures 

If vets suspect cases associated with dog chews, they can report them through the Animal and Plant Health Agency’s (APHA) Small Animal Surveillance.