[hnick]

They might be just removing "to be", that's what I love about English you can break and abuse it and it still mostly makes sense. You could even drop the "the" and "-ed" from those phrases and most people would still understand what you mean by "dog needs walk".

[pyridines]

yeah, they are just dropping "to be". But "dog needs walk" sounds wrong, whereas "the dog needs walked" sounds normal to the people who use it. I don't know whether there is a reason almost nobody says "dog needs walk", but I don't know much about linguistics :)