People should be careful about keeping the privet-eating stick insects that spray chemicals because these can cause breathing problems in people and dogs! Indian stick insects (Carausius morosus) do not do this but there are dangerous ones out there, including at least two on your list Taz! I don't think the dangerous ones should be sold as pets. The topic of dangerous stick insects keeps cropping up on Small-Life Supplies for stick insects and cages on the "Ask Professor Phasmid" page. There are lots of safe types of stick insect to keep and so why put yourself and your other pets at risk?