Anecdotal at best.
As a forum in general we always view the press with a wary eye. All of the sudden when our pets are involved the MSM is gospel.
Remember, this is a very “emotional” subject and the press exploits that fact.
The last set of links are from the government.
Just because they have not pinpointed...doesn't mean it is not happening. Running the wrong tests=wrong results.
This is looking like some kind of chemical contaminate and there are thousands of tests needed to identify it. I have a strong suspicion what it might be since the chicken is sourced through China. I would be curious to know if these dogs were on heartworm medications and if the China source is using an arsenic laced chicken feed like Nitro-3 or Roxarsone equivalent. A combination of the two may be what is leading to the symptoms and based on the reports many of the symptoms are similar to arsenic poisoning.