If you want to fly without a script, the game provides intended mechanics: How adopt me made pets? - Scripting Support
Downloadable executors often contain viruses or keyloggers that can compromise your entire computer or mobile device. Legitimate Ways to Fly Roblox Script - Adopt Me [Make ALL Pets Flyable...
Instead of making the pet flyable, some scripts use "AlignOrientation" or "BodyPosition" to make your character float or fly while holding a pet. If you want to fly without a script,
Using third-party scripts or "executors" like Delta Executor carries significant risks: Roblox Script - Adopt Me [Make ALL Pets Flyable...