Absolute menace

I love my basset to death and I would die for them and I recently just got another one he’s 8 months she’s two months he has been acting out since she came home. He got into stuff as normal puppy would, but I just the amount of times that he’s almost accidentally killed himself because now he can jump up on the tables, even if they’re high up he loves everything he’s not supposed to have especially chocolate. I feel like a failure as a mom. I have everything gated off, but the living room in the hallway and when I do put stuff in that room, I put it a higher up, but now he’s gotten so tall any advice