Which situation would NOT be covered under fair housing laws?

The situation where a tenant violates the "no pets" rule with their dog would not be covered under fair housing laws because it primarily pertains to the enforcement of a specific leasing agreement rather than discriminatory practices. Fair housing laws are designed to protect individuals from discrimination based on specific characteristics, such as race, color, religion, gender, national origin, familial status, and disability.

The key aspect here is that the "no pets" rule is a standard lease condition that applies to all tenants uniformly, regardless of their personal characteristics. If a tenant chooses to keep a pet contrary to this established rule, the landlord is within their rights to enforce the lease terms without being in violation of fair housing laws.

In contrast, the other situations listed involve elements of discrimination based on protected classes or characteristics, such as denying housing due to marital status or race. Additionally, denying a tenant with a service animal is a violation of fair housing protections for individuals with disabilities, as service animals are not considered pets under these laws.