I heard about this a few days ago. It seems to be mostly chicken jerky and that there was a recall on several brands earlier this year. They’re still having trouble nailing it down though.
We had been giving our boy some chicken jerky treats, Waggin’ Tails if I remember correcly. We were flying fat dumb and happy untl about 1 a.m. one night last winter and momma found him having a siezure in the closet. Thankfully we have an all night/emergency vet in town. He came out of the “fit” and we took him to the ERV. He seemed to be okay but they faxed the test results to his regular doc and we saw him later the same morning. He asked us about any treats we gave him on a regular basis and said it it was from China, get rid of it. Only trust products from in the US or from Canada. We checked the bag when we got home and sure enough, MIChina. Tossed it. Some digging is required to find out who REALLY make his treats but it’s worth it. No further episodes.
As for China, follow this rule: if you wouldn't think of eating something from China, why would you even consider giving it to your dog?