Design a captivating black and white vector illustration in pencil sketch style showing a retriever dog with a stick in its mouth, partially submerged in water. The entire composition must be purely monochromatic without any color, using only black lines and marks on white background. Create realistic wet fur texture through directional cross-hatching that shows the weight and dampness of the coat. Render dynamic water splashes with energetic line work and droplets frozen in motion. Capture the joyful, engaged expression in the dog's eyes with careful highlight placement. Include detailed water surface with ripples and reflections using curved parallel lines. The stick should show wood texture with bark details. Use varying line densities to show the transition between dry and wet fur. The composition should convey movement and playful energy. The artistic style should combine realism with illustrative flair typical of contemporary pet portraiture.