Purr and Mutt's headline offer is a 20% discount across the entire site, which works well for most shoppers building a cart of the brand's products. The store also runs periodic sales with deeper discounts on selected items, and there's a gift offer available too. Depending on what you're buying and whether you're a first time customer, different offers will suit your situation better.
Shopping the full price catalog at any spend level. The 20% off sitewide deal is your best bet. It applies to everything on the regular price shelves, so apply it to your basket and check the savings at checkout.
Buying discounted or sale items. Before you assume the sitewide 20% is your best option, check whether the 30% off sale products deal saves you more. If you're building a cart mostly from marked-down stock, the 30% discount on those items will often outperform the 20% sitewide offer. Compare both at checkout and go with whichever gives you the larger discount.
Adding a gift to your order. If the free gift with order applies to your basket total, it's a nice bonus on top of either the 20% or 30% discount. You're still limited to one offer per transaction, so the gift is not an extra saving—it's an alternative to the percentage discounts.
First time customer or browsing before you commit. Signing up to the Purr and Mutt newsletter unlocks special offers and promotions, which can be worth doing if you're new to the brand and want to see what deals might be available next time you shop.
Remember that you can only apply one offer per order at checkout. Once you've built your basket, compare the savings from the 20% sitewide deal and the 30% off sale products deal side by side, and pick whichever delivers the biggest discount on your specific items.