The deposit for Doudian's pet supplies category is 1,000 yuan. This is because Doudian has set up a category deposit system to ensure the reliability and credibility of merchants, requiring merchants to pay a deposit when opening a store, and only after paying the deposit can they sell goods under this category. For the pet supplies category, merchants who open a store need to pay a deposit of 1,000 yuan. It should be noted that the deposit is not something that can be ignored after payment, but will be deducted based on the merchant's violations. If a merchant violates the transaction rules or is complained or reported, the platform will deduct part or all of the deposit based on the actual situation. Therefore, merchants need to strictly abide by the platform rules and improve service quality to ensure the long-term operation of their stores.