Dachshunds are playful, fun dogs, known for their propensity to chase small animals, birds and tennis balls with great determination and ferocity. Many dachshunds are strong-headed or stubborn, making them a challenge to train. In fact, it's been said that you don't train dachshunds, they train you. Dachshunds have been known to have a liking to dig holes in the garden, or chase small animals such as birds, squirrels, or lizards. They have a particularly loud bark, making dachshunds good watchdogs. Dachshunds are known for their devotion and loyalty to their owners, though they can be standoffish towards strangers. If left alone many dachshunds will whine until they have companionship. Some dachshunds are prone to separation anxiety and may chew objects in the house to relieve stress.