The Petco-backed dogwalking service marketplace is reportedly set to close a series E round that will value it at close to $300m.

Rover, a US-based dogsitting service provider backed by pet products seller Petco, is about to close a $40m series E round that will value it at almost $300m, TechCrunch reported on Friday.

Venture capital firms Menlo Ventures, Madrona Venture Group and Foundry Group will all participate in the round as existing investors, according to sources with knowledge of the deal.

Rover operates an online marketplace for dogsitting and dogwalking that includes more than 65,000 sitters across some 10,000 cities.

The…