WASHINGTON—Pet food manufacturer Menu Foods expanded its recall Thursday because of possible cross-contamination between melamine-tainted products and other foods made in the same period.

The expansion includes cuts and gravy pet food, as well as other products that were not made with the contaminated wheat gluten supplied by ChemNutra Inc., but were manufactured during the period the chemical-laced gluten was used.

The company based its decision on study results that revealed cross-contamination, as well as one report from a customer.

The recall now includes additional pet food products in the United States, Canada and Europe.

It also expands the date ranges of previously recalled products to match the period that melamine-tainted wheat gluten was used in manufacturing plants.

More than 100 brands of pet food have been recalled since March 16 because they were contaminated with melamine.

An unknown number of dogs and cats have been sickened or died after eating chemical-laced pet food.