Spray bottles are outdated tools in dog training. Nevertheless they are excellent as food dispensing toys.
You can use any spray bottles as long as the bottles are unused or they have only used to spray water. You can’t give those bottles to your dog that have had any detergent or other chemicals inside them.
I put kibble in these bottles, but you can use any dry treats.
It took Miki about 1-2 minutes to get a small handful of kibble out.
This bottle has a narrow neck so it’s a bit more challenging.