Has your dog (or cat on rare occasions) licked a cane toad? The best thing to do is to immediately start cleaning out their mouth.
Point your dog's mouth towards the floor and using a wet rag, wipe the inside of their mouth, including gums. Rinse the rag and repeat. Next, thoroughly wash the mouth out for 10-15 minutes using a slow trickling hose or tap. Ensure the water is directed at the side of the back teeth with the water draining out through the front of the mouth.