I don't think there will be drug dogs. Have you not taken a domestic flight from your airport before? Plants show up as a different color on the xray, so although I don't think itd be caught in a shampoo bottle, and even if they thought something was suspicious they would just take the bag and do a routine search. When they get to your toiletries bag they will open it make sure nothing out of ordinary is in there and then put it away, they won't open up your shampoo bottle. They're not going to like connect exactly where a different color on the xray was to where exactly in the bag they're checking. Both ways I think you'd be fine.