Purina Pro Sport Formula should always be your first choice if your Doberman performs tough jobs for hours. The high protein content helps to maintain high muscle composition. Moreover, it is ideal for puppies because of the chicken as a top ingredient.
Yes, there is a Chihuahua Doberman hybrid mix. This mix is the offspring from crossing a Chihuahua with a Doberman Pinscher. Despite putting up a rather aggressive front towards other animals and strangers, you may find this Chihuahua Doberman Mix clingy and vocal with its barking.