Why does my dog get diarrhoea after eating canned dog food?

When my dog eats just dog biscuits from her dinner, she’s fine… but after she eats canned dog food, or even canned dog food mixed with the biscuits, the next day, we find runny dog droppings all over the place.

When my parents dog eats the exact same dog food, he is fine.

I do have the ingredients here from the Coles Complete Balance dog food can that we use.

Selected Meat and Meat by-products (derived from chicken, beef and mutton). Flour, Rice, Vegetables, Gelling agent, Natural Colour (caramel), Oils, Vitamin and Mineral Supplements.

Thank you.