Are domestic cats — such as “Bowl” and “Ruth” — considered ritually impure (najis)? And is there a dispensation regarding their ritual impurity for those who suffer from severe scrupulosity (waswas) and hardship in removing ritual impurity?

We advise you to strive against obsessive thoughts and disregard them. Do not rule that the cat is impure or that impurity transfers from it unless you have absolute certainty. Dry impurity does not transfer to dry objects. The droppings of animals whose meat is not permissible to eat are impure according to most scholars, but it is possible to adopt the view of those who consider a small amount of impurity to be excusable. Purifying an impure spot is done by pouring water over it abundantly, and the earth is purified by drying, according to many scholars.