It was originally bred to herd by biting, and is known to nip running children. It forms a strong attachment to its owners, and can be protective of them and their possessions. It is easy to groom and maintain, requiring little more than brushing during the shedding period. The most common health problems are deafness and progressive blindness (both hereditary conditions) and accidental injury; otherwise, it is a robust breed with a lifespan of 12 to 14 years. The breed ranks 10th in Stanley Coren's The Intelligence of Dogs, rated as one of the most intelligent dogs ranked by obedience command trainability. The Cattle Dog needs plenty of exercise, companionship and a job to do, so a non-working dog might participate in dog sports, learning tricks, or other activities that engage its body and mind.When on home ground, the Australian Cattle Dog is an affectionate and playful pet. However, it is reserved with people it does not know and naturally cautious in new situations. The Australian Cattle Dog demands a high level of physical activity.