Sorry to hear...
So you also have to be there when the vet injects it as it drifts asleep a few minutes later (5-10mins IIRC). It was gentle and painless, just drifted off. It's tough.
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Charlie...total B/S!!! a few min, try around 30 sec. from shot to R.I.P
Chirpy sorry for you loss such a young pup.