The F.D.A. has received more than 8,000 complaints regarding tainted pet food.
After an investigation, the agency believes they found what is to blame.
Two weeks after that massive pet food recall left dog and cat owners fearing the worst, the worst may not be over.
The food and drug administration is now looking at the possibility that a dry pet food may also have been contaminated.
It now says it is testing did not find rat poison as some suspected earlier, but did find some wheat gluten was tainted with Melamine.
A chemical used to make plastics and as fertilizer in Asia.
"There is one company that we are aware of that may have gotten a shipment of that wheat gluten. This is a company that does produce dry food," said Stephen F. Sundlof, of the F.D.A., Center for Veterinary Medicine.
That manufacturer has not been named at this time.
He continued, "We are not fully yet certain that Melamine is the causative agent of illness and death in pets."
The members of the Ethical Treatment of Animals is demanding a recall.
Bruce Friedrich, of PETA says, "The fact that F.D.A. is still not calling on company it won't name to issue a recall is morally objectionable."
The demand comes on the heels of the recall of 60 million containers of wet "cuts and gravy" style food made by menu foods and sold under brand names like Iams and Eukanuba.
Menu foods says it has stopped using the suspect wheat gluten.
"We have removed the problem from out system," said Paul Henderson, CE0 of Menu Foods.
For pet owners more answers can not come soon enough, as they are now left to fear more types of food could be putting pets at risk.
Wheat gluten is also used in some human foods, but the F.D.A. has found no indication that the contaminated ingredient has been used in food for people.