The present disclosure relates to a pet collar breakaway buckle device configured to be worn around the neck of a pet. Certain pets may have a natural instinct to wander, climb, and/or squeeze in to small places. Pets that squeeze into small places may catch their collars such that the pet becomes stuck. The pet collar breakaway buckle device described herein may be configured to break away under the bodyweight of the pet, reducing the risk of strangling and/or other unintended injury to the pet. A pet owner and/or other person may apply a compressive load to the buckle device to attach the collar around the neck of a pet and a tensile load to remove the device from the neck of a pet. In some implementations, the pet collar breakaway buckle device may comprise a strap, a first interlocking clasp, a second interlocking clasp, and/or other components.