My aunt used to work at a vets office and then at a humane society.
She said they just used the big dog vials and made the dosages different depending on the size of the dog.
She said theres nothing different between the under 20lbs or over 110lbs.
I don't know the dosages for different sized dogs though, sorry.
Good luck on finding it thought, it'll save you a lot of money.
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