The treat Mouse for cats from Doc & Phoebe's is a good alternative for the classic treat ball. The mouse is 'adjustable' so you can choose how dificult it is to get the food or treats out.
This mouse has a soft skin to simulate its prey. Cats love to pick it up and use their claws to enhance the experience. Its shape is designed to roll and move in the way a prey would.
Easy maintenance: - dishwasher safe - Skin can be washed by hand or in the washing machine (30°C) in a washing bag for protection and to keep them separated from your socks ;-) No tumbledry. Tip: don’t use detergent with citrus scent. Cats can still smell that afterwards and don’t like citrus, so it will make their food less attractive when their mice or sleeves (or any feeding of drinking bowl) is cleaned with citrus.