Pet leash assemblies, pet collar assemblies, and methods of using the same. Pet leash assemblies include a tether and a gated clasp coupled to the tether. The gated clasp includes a body, a gate hinged to the body, and a biasing member that pivotally biases the gated clasp to a closed configuration. The gate may include a projection that extends away from the body. When the projection is urged toward a terminal region of the body, the gate is pivoted against a bias of the biasing member and the gated clasp is configured to an open configuration, in which a coupling ring of a collar may be inserted into and removed from a passage defined between the gate and the body. The clasp may include a sliding actuator with a gate-engagement surface positioned to engage and pivot the gate against its bias when the actuator is translated toward the gate.