sedative for dog

Question
the strap around the neck of my dog has tightened  leading to deep abrasion, hence to untie it we need a oral sedative which ll make it very calm
plz suggest!!

Answer
Get your dog to a veterinarian right away. You might accidentally cut a vein or artery getting this off and it will need medical attention for the abrasion as it is.

There is nothing you can give this dog at home to sedate it safely without death or injury.
Do not attempt this yourself, get your dog to a vet right away!!