He looks a bit small for three, in my opinion. He's smaller then my female who was stunted because her previous owners bred her too early. I'm judging from the cage and the water dish. the dish is the same one I have.Get him off sand!
If he's three, he MIGHT not eat the sand and get impacted, but why risk it? Mist his head till he starts to lick and give him weekly baths. Might want to soak him tonight if you're worried about if he's dehydrated. Get a UV light.
If the previous owners couldn't afford crickets, his UV light, if he has one, should be changed. Dead crickets are not nutritional. live crickets or cockroaches are better. At this age, veggies are more important than meats. He still needs calcium covered crickets, but not as his total diet.
Congrats on your new rescued baby! Two of mine are rescues and the third is their daughter. So I know you will have ages of fun with him! :)
Some good sites are:http://www.beardeddragon.org
(has a forum as well)http://www.beautifuldragons.com/Edited at 2011-07-10 02:52 am (UTC)
He seems to be a little thin. Get him off that sand, so not to risk impaction. Get him on a regular soak. Put him on cricket and phoenix worms. Meal worms will cause impaction. Give him a generous helping of good greens that are deep and dark. Please, no iceberg. That is pure junk.