Level 9160 is impossible to complete without boosters currently as there is a glitch within this level.
The problem is that, although the line blaster and key are set to go at the same move, the line blaster goes first, so your Pets slide across the locked blocks before they key is triggered then they are stuck within the game unable to be saved.
⭐️My solution to this was to get the Pets all down and ready to save, then use a key booster one move before the key within the level is due to go!⭐️
See how to do this in the example below.