Martingale collars are an excellent choice for virtually any dog, better than traditional collars according to many pet parents, for the following reasons:

• Safety. If you own a dog who is nervous, aggressive, or who has a high prey drive, you likely have the concern of him or her slipping out of a collar when in a situation that they consider to be stressful or exciting. A martingale collar tightens when a dog tries to pull away from its leash, keeping your dog securely under your control, unlike a traditional collar that dogs can easily slip out of.
• Comfort. Since martingale collars tighten when pressure is applied, for example when a dog tries to pull away from a leash but loosens when the pressure is released, your dog will always be comfortable wearing this type of dog collar. 
• Lifespan. While you should expect to purchase many collars throughout your dog’s life, martingale collars are generally the longest lasting because they can easily be adjusted to grow with a puppy, and because they are often made of durable materials.