Hello Freddie,
If your vet is using laughing gas, there is hardly any problem, because they use it only during the operation and when the operation is finished, the dog get pure oxigine and is reather clear about 5 minutes,
Then he needs time to recover but after a half an our, he can walk with you to the car and is quiet wellm
Ask your vet for it.
I wish you succes with your dog and don't worry,
Letty
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