The chief executive of the nation’s largest specialty pet retailer of services and solutions has left the building.

PetSmart announced that Michael J. Massey has stepped down from his position as CEO, president and board member. Raymond Svider, managing partner at BC Partners, will serve as executive chairman and oversee the company’s operations with the senior leadership team while the board searches for a new chief executive.

Massey joined PetSmart as CEO in 2015 after its private-equity buyout by a consortium led by BC Partners. Prior to PetSmart, he served as CEO of Collective Brands, which owned Payless Shoe Source.

Massey has played a crucial role in the company’s growth, particularly online. Under his leadership, PetSmart made a number of strategic moves…