Pet Valu and Pet Supermarket have merged to become a leading pet specialty retailer in North America.
Known as Pet Retail Brands, the combined business will have more than 930 stores, which will generate around $1bn in retail sales across the US and Canada.
Terms of the deal have not been disclosed.
Roark Capital managing director Ezra Field said: “The combination of these two highly complementary businesses, both long established brands with strong cultures and deep commitments to local communities and helping pets, will create the leading community focused pet speciality retailer in North America.
"Together, both brands will benefit by sharing infrastructure, resources and best practices to deliver superb value to both Pet Valu and Pet Supermarket’s loyal customers, committed employees and business partners.”
Both Pet Valu and Pet Supermarket sell a wide range of pet food, supplies and services.
In August 2009, Pet Valu was privatised by an affiliate of Roark Capital, while Pet Supermarket was acquired by an unit of Roark Capital last April.
Pet Retail Brands will continue to be based in Markham, Ontario, while Pet Supermarket will be based in Sunrise, Florida.
Under the deal, Thomas McNeely will become president and CEO of Pet Retail Brands. He has been CEO of Pet Valu since August 2009.
Diane Holtz announced her retirement as Pet Supermarket president and CEO.