prey driven dog can be so unpredictable with small animals, I wouldn't risk it. I have Dachshunds and my male Snoopy, never bothered my dragons, not even the babies. He liked watched them and would follow Barney around when he was running loose and never showed any signs of wanting to attack him.
A few months ago I got a blue tongue skink, snoopy was interested in him but not too much until one day out of the blue, Snoopy jumped on my lap and bit the skink on the head. Now all Snoopy wants to do it try and attack the skink. I either lock snoopy outside for skinky free roam time or take Puff out in the yard to run around. I'll never trust him around another small animal.