accidently gave dog double dose of insulin -...

Hello and thank you for asking your question on just answer. My name isXXXXX will try to help.

How is Peptia doing now?

When did she last eat? How much did she eat?

How much does she weigh?

I would give her a teaspoon of karo syrup, or pancake syrup, now.

If she starts to become lethargic, give her another teaspoon of the syrup, every 10 minutes until she seems to be normal again.

If she does not respond to the syrup, then you need to take her to the emergency clinic where they can give her i.v. dextrose (sugar).

You can give her the next dose of insulin, at the regularly scheduled time, as long as she is acting normal and eats well.