Carabiner or clasp? How about both! After determining the carabiner on one of my Tuenne leashes was to large for my miniature goldendoodle's harness ring, Tuenne confirmed I could purchase an additional bottom cap assembly with a clasp. The order arrived within 3 days, and I swapped out all the parts within a few minutes. Now my puppy has a short and long Tuenne leash that is fully functional with her harness. I am happy, my puppy is happy, and all my neighbors, friends, and coworkers love my Tuenne leashes.