Carnivores eat meat. They need extra-sharp vision that focuses straight ahead at their prey. Their eyes are spaced closely together.
Herbivores eat plants, and have to be constantly aware of their surroundings. Their eyes are spaced widely apart, lie on a diagonal, and look off to the sides.
The herbivore needs to possess superb peripheral vision that helps them see threats coming from all directions. In order to have better peripheral vision, their eyes must be spaced widely apart on their head.
Notice how the eye sockets bugle outward in order to encircle and protect the widely placed eyes.
The heads of dogs along with other medium-sized animals tilt down slightly. The more massive an animal head is, the lower it hangs. The larger the head, the thicker the neck will be. A large head needs stronger neck muscles to support it.
Massive animal heads often hang quite low. One extremely massive animal's head doesn't hang low. Can you guess which animal and why?
Yes, it is the elephant. The neck on an elephant is very short so the neck looks like it is fused to the body.
The Anatomical structure is very important to know. Notice the neck; if you know the structure of an animal, you can usually draw it more correctly. Anatomical names are the same in all dogs, and in fact in all animals. Anatomical names should be learned.
Leonardo Da Vinci knew the importance of learning the structure of things. He would dig up human bodies and dissect them in order to learn the muscular structure underneath. Then, he would draw them. His drawings are quite famous.
Add the curve of the spine, the mouth, the tail, and the other back leg.
Remember the body's not perfectly symmetrical. For instance, the tummy and paws might be slightly larger than the chest especially when drawing puppies.
Erase the lines that you don't need. Make the dog your own and add character.
You can add expression. Notice the wrinkles around the mouth and the lines around the eyes that give the dog his expression. For example, a happy dog looks as if he is smiling.