What is "bonio"

Bonio is a popular brand of dog biscuit sold in the United Kingdom. It was originally sold by Spratts Patent Ltd. of London some 75 years ago, but through various acquisitions it is nowadays marketed by Nestlé Purina PetCare, until recently under their Winalot brand. Their factory is located in Aintree, Liverpool and supplies the whole of the United Kingdown with the product.