Two killer pig dogs will be put down after a Canberra tribunal refused the pair a stay of execution.

The ACT Civil and Administrative Appeals Tribunal upheld a decision by Domestic Animals to destroy two Bull Arab cross dogs which had scaled a two-metre fence to kill a German shepherd next door this year.

"The tribunal considers that the combination of being hunting dogs with the attack of Khan [the German shepherd] leads to them being considered as a future danger to the public or another animal," a decision published last week said.

The tribunal heard the Bull Arab crosses, named Kogan and Boo, had been cared for by the owner’s partner as he had been interstate for work in January.

Between 8.30am and 7pm, the dogs jumped a two-metre high Colorbond fence and attacked and killed a German shepherd, Khan, who lived there.