New dog bowls for Scooby

Today I decided to buy raised dog bowls for Scooby, my border collie cross who has arthritis in his front leg, to make it more comfortable for him to eat his food.
Unfortunatly to get him to accept his new bowls I had to lower them nearly to the floor. Guess I will have to raise them gradually as he gets used to them.
Sometimes he's just too clever.