Hoi :D Welcome to Subeta!
I haven't played with my pets in forever, but I do believe toys are single use. If I recall correctly, to keep your pets happy you can simply equip a minion (a mini pet) to your pet, and your pet should stay at 9/10 happiness
You can obtain minions from places like here
Hope that helps!
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2025 Stalacbite, Focused (7)