Abstract: The present invention consists of a pet carrier with two compartments. The first compartment, in which the pet is placed, consists only of side walls and a bottom. The second compartment consists only of side walls and a top. The second compartment is configured to be placed, in telescopic fashion, directly over the first compartment. In this manner, the second compartment moves up and down in a vertical plane from a lowered position in which it substantially covers the first compartment, representing the smaller or collapsed configuration of the carrier, to a raised position over the first compartment, representing the carrier's larger or expanded configuration. The two compartments are locked in the raised and lowered positions by manually operated spring snap locks. Releasing the snap locks simply and instantaneously allows the carrier to be collapsed or expanded.