The more money you spend on food, the greater the chance that rare cats will appear. More total cats will also appear, especially if sashimi is left out. However, rarer food is eaten faster, and must be refilled more often. You you do not have the money to spend on more expensive food, you can still attract cats with the low cost food when used with lots of toys. When you put out moderate quality food (anything better than Thrifty Bitz), a large white cat named Tubbs will probably appear. Tubbs will eat all your food, then remain there for a while. If you refill the bowl, Tubbs will immediately leave. However, if wait instead and allow him to leave on his own, you will leave a lot of fish.