Is it permissible to own a dog for a farm for the purpose of warning against strangers, along with the permissibility of playing with it and taking it for walks to bond with it?

It is permissible to keep a dog for guarding houses out of need. However, one should avoid touching or interacting with it due to the severity of its impurity. The least harmful method should be employed to familiarize it with the household members so that it does not bark at them. If a person's body or clothes are touched by the impurity of a dog, they must be washed seven times, the first of which is with earth.