Hollings Filled Hooves are a natural, quality treat for dogs. Secondly they have a tasty beefy filling that is sourced and manufactured in the UK. These hoovers are made from 100% British Beef, and are a tasty treat that your dog will love to get their teeth stuck into.. Hollings Filled Hooves treats are a natural bone style treat and can splinter. Always supervise your dog when feeding bones or treats