This is great for dispensing big treats or peanut butter and for dogs who go nuts trying to get the ball out. The medium is a big too big to use as a ball, but one of the best treat dispensers superchewer has to offer. The ball inside is a bit too small but, when the ball does come back out it’s easy to put back in and pretty durable. Easy to toss in the dishwasher for cleaning.
For the medium, hole is an inch and a half or a little under 4 cm. 1oz solo sauce cup for size reference.