Should Fences Be Dog Proof?

How about this for a newly fitted fence, with a gap so large the owner has had to fit chickenwire to stop her dog (or small children!) from escaping.

The question is, are there standards for how a fence should be fitted? The quotation from the supplier gives details of length, height, materials, even penalties the company will impose if the owner "impedes start of work". It even includes 7 year warranty on workmanship. But nothing about whether it would, or should, be dog-proof.
Ray White Beecroft manages one of the properties involved, whose owner consented to have the fence installed. We tried to discuss this with the fence company involved, but they refused to discuss it. Their contract was with the owner of the house on the other side.