Black mexican king snake

Question
My Mexican king snake has stopped feeding, he is not lethargic and still has his normal routine, he also hasn't lost any significant weight but hasn't taken any mice for about 8 weeks now. I cannot see any mites e.t.c. I have tried changing where I get the mice from but to no avail. is this normal or is a visit to the veterinarian's in order?

Answer
Dan,
  I accidentally rejected this question on the first attempt! Sorry! 8 weeks is not that long for a well established snake. Keep trying to mix it up (different color mouse, rat instead of mouse, different time, live vs frozen etc.). If he goes another month without eating, go ahead and take him to a vet.