Who makes it
Who makes 4health dog food?
The maker
dry = Diamond (named Diamond-made in the 2012 recall); canned/wet = Simmons (4health canned appeared in the 2017 Simmons-plant foreign-material cluster).
Confidence in this attribution: supported. A co-packer's recall history and quality record belong to every brand it makes, so 4health's safety profile is Diamond Pet Foods's.
See Diamond Pet Foods's full record: credibility, recalls, and the other brands they make →