Tried the glue thing...some held, some didn't...and that's when I applied some force to try and get it to pop open. My biggest fear is what Boriqua mentioned, that the dog would do a "bolt & run" maneuver and it would come apart. Don't want any legal challenges.
Today I'll go to the Tandy store and have them do a one-on-one with me, see if they can get it to hold properly. I'm still awaiting my SLC double cap order, should arrive next week. And I may pick up a package of Chicago screws while at Tandy today. Anyways, I'm working on several options and do appreciate the comments.