oh its not my work, i found it and stuck it here for reference/inspiration, orginial guy was u/Madrilous
for the heads I believe that it's the skulls from the games workshop skull range with small glass beads in the sockets.
Check out Zombicides' Zombie Dogs. Scale is good and they have some variety (4 poses). They look less augmented and a bit more like vicious fighting dogs. Although I'm sure a little green stuff work or a raid of the bits box can give a more cybernetic feel.
You get 20 of them for about £20 so...