Fleas were a major plague on nineteenth-century dog owners. In novels dogs were generally described as being bathed in carbolic soap once a week to keep the fleas at bay. In novels written from the dog’s point of view, the dog would often complain that the soap smells funny or bad.
Further below, the advert addresses sportsmen and huntsmen directly, suggesting that they in particular could use the soap to “cleanse the kennels and flesh-houses, &c.” Flesh-houses seemed to refer to what we’d call a meat or butcher’s shop, and is a term that was in use since the sixteenth century. This ad is from the nineteenth century. By the twentieth, I’m pretty sure the term, despite its 300+-year history, fell out of fashion. Eating “flesh” is so… so… clear.
It’s nice when they assure you that the product is “free from poison.”