Missing dog, Cairns

Mask, is a 10 year old male jack russel/foxy x. Born without a full tail, he has a little stump tail. He was wearing a collar with a tag with his name and my phone number on it. We were on holidays in Brisbane, had a family member looking after the dogs, as we have 2 other female dogs aswell. Family member was at work, when a storm came through with thunder and lightning, Mask escaped scared. Has not been spotted since. He has escaped a few times, we get him back in no time. Usually!! This makes us think that someone has got Mask.