Utilize the input text as a context reference, choose the right relationship between Spillers and food from the options. Options: product/material produced, manufacturer, distributed by, industry, position held, original broadcaster, owned by, founded by, distribution format, headquarters location, stock exchange, currency, parent organization, chief executive officer, director/manager, owner of, operator, member of, employer, chairperson, platform, subsidiary, legal form, publisher, developer, brand, business division, location of formation, creator.

Spillers wanted to be completely confident there were no adverse side effects for the canines, before the new products were sent out out into the market in a highly-competitive pet food industry.

Answer: industry