In agility, we can condition non-toy-motivated dogs to enjoy play by using "Tug-N-Treats ". Basically, it's a fleece pocket with a nylon handle. You stuff the tug-n-treats with food, and every time the dog shows interest in the toy, you treat the dog. The best time to initiate play is right when you come back home because, generally, that's when the dog is most energetic and most willing to spend time with you. Give the toy to the dog, let her mouth it, and pull it back. Pat her on the butt with it, get rowdy, act like a fool. Play with her body and continually offer her a toy but always take it back. When you give dogs a toy and quickly whip it away, they tend to bite at it out of instinct. Eventually, you can teach the dog to play, but you have to initiate it in a way that makes sense to dogs. Patting your thighs and staring in the eyes, for example, won't entice a shy dog. Scratching their bum, sprinting away, giving/taking away the toy, sprinting away, etc. will entice a dog.

Also, definitely try stuffies. Giselle has only played a handful of times and they've all been with stuffies. She couldn't care less for tennis balls

ETA: OH, you're in Stockton!!! If you want to learn about agility, please PM me, and visit Bay Team's website: bayteam.org <---AKA the bay area agility lover's heaven