The first vet I ever took Cody to (for a teeth cleaning) gave her Ace 'cause she was a pain in the butt & barking, barking, barking (and yes she was a grey! But a barker). They gave it to her in the morning and she was still asleep at 4pmj!! When I had to pick her up at 6pm 'cause they were closing, someone had to help me CARRY her to the car 'cause she was still so groggy!
I made very sure she NEVER had Ace again... and changed vets the next day! (My next vet told me once, when Cody had been there all day for x-rays, that she WISHED she could have given her Ace!! She was being a barking PITA - but once they let her OUT of the kennel to roam the place, she was fine! (Especially after a vet tech gave her part of her tuna sandwich! Smart girl, that one...)
NO ACE!!!