To enable this, create a smart collection named All Products and set the condition to 'Product price is greater than 0'. You can create a collection through the 'Collections' menu in Shopify admin. Or you can turn this section off through theme settings.
For eye protection or fashion, ask for it by name. Dogs need UV protection just as humans do, and if your dog is out and about with you, and you have your sunglasses on, your dog should be wearing Doggles! Great prices at FurMinded.com.