Unfortunate to hear this news. But please do not throw the hunter or PH under the bus until actual knowledge of the facts are known.
While it is true that Namibia does not allow trophy hunts for leopards with dogs, Namibia does allow the use of dogs for problem leopards.
It is possible that the hunter was there to hunt a leopard without dogs and a problem leopard issue arose to allow the use of dogs.
So we need to know the facts. To just say using dogs is illegal in Namibia is not true.
If a problem leopard was taken using dogs by an America hunter, the PH could get permits for export if all other aspects were legal, such as location of kill.
So lets get the facts first before saying they did anything illegal.