This section sets out the criteria that determine if a dog is suitable for use with the Echo-blinddog system. For your dog to benefit from this echolocation device, he must meet the following conditions: Significant Vision Loss: Your dog must have substantial vision loss, making him dependent on alternative methods to navigate his environment. Correct Hearing: Your dog must have functional hearing to hear the sound signals emitted by the Echo system. Sufficient Concentration Capacity: Your dog must have satisfactory concentration ability to interpret and react effectively to echolocation signals. Good General Health: Your dog must be in good health, without major ailments, ensuring safe and optimal use of the system. Suitable Age: Your dog should be in an appropriate age range, generally avoiding use on puppies, due to their continued development of spatial learning. Older dogs should be evaluated individually based on their health and adaptability. This chapter provides detailed information on the essential criteria for determining a dog’s eligibility for use of the Echo-blinddog system, ensuring successful integration based on the specific needs of each canine user.