Start small at first. I put my cats on canned first, the bigger meatier chunks the better instead of the paste stuff. then mixed small chunks of meat in it, gradually mixing bigger chunks. Once they were taking decent size chunks ,I started decreasing the amount of canned gradually. Once they were off canned and only eating meaty chunks, I again increased the size of chunks, until eventually they were eating whole raw pieces. My oldest cat was the easiest to convert, my boy was the hardest. Patience is key. Some cats are harder to convince than others, and it is Ok to go backwards in the process before going forward again. It won't ruin them in any way. Just make sure he eats enough food every day. Cats can have a hard time skipping meals.