@Emily Hamblin hide and seek is actually one of my favorite games to teach to my dogs! We start with a favorite toy (or food, if they're more food motivated) that he can recognize the name of, and start in easy to search spots- around the corner, under a rag, etc. and just repeat 'Seek ____’ (warning, if you've taught them 'speak', it sounds very similar and they might get confused 😅). You can use whatever terminology you like, as long as you keep it consistent! And you can help them find it as you repeat (occasionally, not constantly) your phrase (ex. Seek ball). Then LOTS of praise when they 'find' it. Then we work on recognizing family members by name, and start 'seeking' them when they're in the same room/right next to us or similar. And lots of praise when they go over to them (or even just look at them in the beginning, but working up to them going to the person). Usually by that point they have it down well enough that they can then find them pretty easy, but you can continue to increase the difficulty by having them hide under a blanket, in the next room, etc. We use it primarily for play, but the purpose behind it was in case of any emergency. I bet Toby would LOVE that game! If you're needing a busy brain activity, I use little spots of their food hidden around a room. I have them 'sit' and 'stay' in another room, set little piles of food around- some obvious to see, others a little more tricky- and then 'release' them to 'Seek food'. It's great for getting their sniffer going!! Reactivity on leash is a very common one. And there's LOTS of ways to go about it. But emphasizing that it's a better (easier/more comfortable) choice to keep their attention on you, will help build their neutrality to outside stimuli!