Our Quick Guide:
 
Difficulty: Easy to Medium
Food/Treats: Wet and Dry
Interactivity: Can Do Alone
Durability: *Tough Toy*
 
These are really tough and durable - and often a little harder than they look as the food spaces are fairly narrow - they are more a medium level difficulty for some dogs for that reason! These are for wet and dry food. The small size is suitable for smaller dogs, but also makes a fairly easy option for bigger dogs (who have longer tongues and will reach the bottom of the shallower grooves more easily). 
 
They are top-rack dishwasher safe too!
 
Small is 26cm x 21cm x 4cm high
Large is 40cm x 33cm x 6cm