I have had my leo since february. His name is Elvis (i think its a male) the last two weeks he has been very lethargic and slowly not eating, and now more recently hes not pooping. it started when he was having trouble shedding. i waited a few days before i helped him. i had to soak him in warm water and use a q-tip. i have entirely cleaned out his cage, fresh crickets and mealworms. but still nothing. as of right now he hasnt pooped in about 4+ days. he barely moves, and when he does its slowly, he doesnt even do much when i open his cage and touch him. he is starting to lose weight and i am very worried about him.
I would go to the vet hospital if he's constipated for 4+ days and not eating/lethargic for 2 weeks.
A veterinarian will have to do a physical exam to determine cause.