You guess right, the wooden planks can be knocked down from the pipes in the sewer to make the dog fall in the hole. Since I had to make my own AI for the animals, and I'm a noob, their movement is updating every tick which makes their speed super inconsistent. The fish rat was supposed to be a tricky test of timing a jump off the pipe, but I may have made it too difficult. Sometimes it moves super slow and it's way too easy, so it can be hard to judge. I'll probably revisit this project after I learn more and make an updated version that isn't held together with duct tape and chewing gum lol