Dallas Simpson's Miserable Child

Anyone know why a lot of the ugly 70's art featured sad children with animals?

 This is my favourite from my Dallas Simpson collection. Love the colours & it's really nostaligic for some reason.

 I think my granny used to have that bizarre print (that I still don't 'get') of a sad girl standing in the corner of a room with a lassie dog watching her.
What was that all about?