From Diapers To Pets, Amazon’s Quidsi Introduces Wag.com 

At launch, Wag.com will offer 15,000 pet products — about the same amount you can find in big box pets supply retailer. Over time, that number will grow to 25,000. Orders of $50 will be shipped free.

Quidsi seems to know what it’s doing. It started with Diapers.com, which quickly became the biggest seller of diapers online. Last year, it expanded into drugstore items with Soap.com. And now it is moving into pet supplies. An online toy store called Yoyo.com will be next.

Wag.com’s offerings will go way beyond dog treats, with products for dogs, cats, birds, fish, reptiles and other small animals. The offerings will include mass and specialty branded food, litter, toys, vitamins and medicine, grooming supplies, clothing and accessories.

Quidsi was acquired by Amazon in November 2010, but the company has stayed at its original New Jersey headquarters and continues to be run as an independent subsidiary.