Safe to take off the pet collar and leash, the collar can be used as long as it is directly put on the pet's neck. When the pet is walking slowly, the collar is not tight and very comfortable, but if the pet runs fast, the collar will be tightened to prevent getting lost. Compared with the traditional design, this design is a great improvement. The traditional collar buckle often catches the hair and skin, and sometimes it is difficult to fasten because of too much pet hair. The collar also needs to be adjusted every time, which makes the pet uncomfortable. If your pet move, it is difficult to see the adjustment button clearly with too much pet hair. Anyone who has used traditional pet collars knows that pets are easy to escape during activities, causing their beloved pets to get lost, and this product can be tightened when pets move, so that they will not be lost, and it is safe and comfortable. The leash can be adjusted in two lengths, with a total length of 1.3 meters. You can put on the D buckle to shorten the leash by half.