Bearded dragons aren't poisonous. They rarely bite, even if provoked.
Well, they do have venom, but it isn't in any way harmful to humans or even toxic for that matter
Their main line of defense is their spikey exterior.
That guy looks mighty fierce though! I've been wanting one foreverrr..but I already have my red tail boa and I don't think my dad wants another reptile in the house haha!