Is not pillow shading, Is that I tried to shade the snout but I didn't get to know how to do it. I Tried to make the light come from up-left but I failed to do it.
When shading fur in small images, focus on large clumps, perhaps breaking them up with thin lines of either shadow or highlight. You tried to put too much detail into the fur, drawing small clumps, and as a result, the head as a whole has no sense of form, and the fur reads like noise rather than as fur, especially on the neck.
One thing that's probably hindering you is that you're using either front lighting or pillow shading - I can't tell what your lighting logic here was, but either way, the result is harder to work with. Taking the time to understand how the shading should work and choosing an interesting light source can save you a lot of headache in the long run by giving you well-defined shadowed areas to work with. When you know exactly what side of something should be lit and which should be shaded, it's easier to define the forms, and to know where to have more highlights and where not to have any.
Its an emo dog! XD