DS (21 months) is very strong willed and reacts badly to being told off/or told no. He will pull our hair (often), bite (less often) and will also deliberately when annoyed walk over to ddog and pull two fistfuls of hair out. He now keep him and the dog apart as much as we can, he'll be lovely to the dog for long enough that we'd let our guard down and then when in a temper would do it again. He goes to a childminder so we really need to curb this behaviour before he hurts another child or god forbid one day gets close enough to a dog that isn't as sweet as our poor little pup. I'm just not sure how to best respond. Has anyone got any advice?