My spur thighed tortoise has almost stopped grazing, will only take very small amounts of food from me before turning away. He has always previously tucked in to a pile of food. He is 15 yrs old but less active than previous years. He has been like this for about 6 weeks. Otherwise he appears well and I can see no sign of a problem. I only want an answer to this question and I do not want to sign up to any monthly plan.