If your spayed female has poor bladdercontrolas a result of her spay, or if your female drips urine due to excitability, old age, or another medical issue, you can use the harness to hold a pad in place.
Older dogs like humans find it difficult to control their bladders for long periods as they enter their twilight years and one of the more common causes for adult dogs who won't stop peeing in the house are behavioural issues.