The Ol'Roy dog biscuits were purchased at Amigo, a supermarket chain owned by Bentonville, Ark.-based Wal-Mart Stores Inc. (WMT), according to Victor Collazo, chief of Puerto Rico's Veterinary Medical Association.
The deaths of the miniature schnauzers were the first in the U.S. Caribbean territory stemming from the contaminated pet food, Collazo said in a statement.
Testing has revealed that wheat gluten, a protein source, imported from China was contaminated with melamine, used to make plastics and other industrial products.
The U.S. Food and Drug Administration has received thousands of complaints but has confirmed only about 16 pet deaths. Other sources put the death toll much higher.
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