The glass bowl in the farmhouse is the cat's dish. Take it to the Diner and ask the waitress to fill it with milk. Take it back to the farmhouse and leave it downstairs while you go to find the cat.
Climb the wire to the upstairs bathroom, and turn on the shower to scare the cat out of the tub. Click the cat once or twice and you will automatically chase it around, until it goes downstairs to drink the milk. Then it will follow you as you return it to its owner at the Surplus store.
He is at the carrot factory.
Go left from Main Street to the old farmhouse. You have to enter through the chimney. The bowl is on the floor inside. Once you fill it with milk at the Carrot Diner, bring it back and you will find the cat upstairs in the bathtub.
On 24 Carrot Island, the milk is at the diner, and you can take some back to the farmhouse in the cat's bowl. On Shark Tooth Island, the coconut milk is given out free by the vendor near the start of the island.
You have to find the lady in Charlie's Carrot Surplus store's cat, who is in the bathtub in the abandoned house at the carrot farm. To get the cat you have to get the bowl in the house and then ask the waitress in the Carrot Diner for milk and chase the cat down to the milk.
on the factory window
find the bunny guys and by then you will get how to do it
it is on the 24 carrot island on the gas station
fight
Ratman is on Super Power Island. There is a large rat in the sewer entrance to the factory on 24 Carrot Island (climb up into the bypass pipe to elude him).
right beside the cafe place.
hes in the store
If you find the lost cat for the clerk at the Carrot Surplus store, she will give you a crowbar as a reward. (see related questions)