A mother kangaroo had to sacrifice her joey to save herself from a large dog which chased and mauled the young kangaroo near Baranduda.
And the man who had to euthanise the animal said dog owners should look to the horror incident as a warning to "ensure they have control of their pets".
The mother kangaroo had to "eject the joey" after a "large black dog" chased the pair in Baranduda Parklands near Echidna Court around 6.30pm on Thursday night.
The "horrific incident" was posted on the Baranduda Community Notices Facebook page shortly afterwards by animal rescuer Chris Lehmann who had to euthanise the "savagely mauled" young kangaroo.
"Some walkers lost control of their dog which proceeded to chase a kangaroo, separating her and a small joey, which was then savagely mauled by the dog," he said.
"A resident called me, we found him and put him down immediately.
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"The mother kangaroo knew she couldn't get away from the large dog with the load of her joey so she had to eject him to get away.
"That is a survival strategy and unfortunately her joey didn't survive."
Mr Lehmann, who helps kangaroos at the Kangaloola Wildlife Shelter in Stanley, said such attacks "shouldn't happen".
"If attacks like this continue the structure of the mob will be impacted," he said.
"This time of year there are a lot of young joeys around and if dog owners aren't 100 per cent sure they have control of their dogs then they need to be on a leash.
"We have a responsibility to allow wildlife, such as kangaroos, to be in a safe environment.
"We need to be more responsible around areas where wildlife are in their natural environment.
"There aren't a lot of areas such as the Baranduda Parklands where mobs can move around safely and if we allow pet dogs to chase after them numbers will be significantly impacted.
"Baranduda is one of the primary bush reserves where kangaroos can maintain a healthy population."
Parklands Albury-Wodonga said they prefer dogs to be on leashes in the area and walkers to have "responsible control" of their pets.
"The joey was about eight-months-old so was quite a big size and that is why the mother couldn't keep him in her pouch," Mr Lehmann said.
"There is no blame in this story whatsoever, but it is a reminder to all pet owners to keep your dogs under control at all times, especially if there is wildlife around.
"It isn't the dog's fault either, they have a natural instinct to chase wildlife.
"But if the owners can't call their pets back they need to be on a leash to ensure the safety of our wildlife."