The two cats and two dogs completely ignored the fish when we received it this afternoon - they weren’t interested in it at all ... until late at night!
The old cat started rolling in the discarded fish and then it was game on. She started sneaking up on it, poking it and then wrestling it. The other three just ignored the going-ons - still not interested.
Didn’t come with instructions but we used initiative and was easy enough to get working.
If the animal/s aren’t interested, you could use the fish to store earings, coins etc.