First of all I'd put your sale items all in one 'SALE' section. It makes browsing easier for the customer. Secondly, I found your listings a little bit confusing and overwhelming. I love the custom pet product idea but you're also doing items for people, and the organisation of the pet products seems a little bit complicated.
I'd recommend having fewer products in a more organised shop with more organised information before you alter your prices. If they've sold at that price so far, there's little point making them cheaper unless you want rid of stock or are having a sale. But if you can bring down production costs, you might also be able to bring down the price without decreasing profit.
Reading that back sounds really negative - I don't mean to be harsh, your shop is overall really lovely, but you might want to address other aspects of the shop before tweaking the price. :)
Good luck!