What drug would be administered to a puppy that is not breathing adequately?

Dopram, also known as doxapram, is a respiratory stimulant that is commonly used in veterinary medicine to stimulate breathing in animals that are not breathing adequately. In the case of a puppy presenting with inadequate respiration, the administration of Dopram can help increase the respiratory rate and improve oxygenation.

This medication acts on the central nervous system to stimulate chemoreceptors, ultimately enhancing the drive to breathe. It is particularly useful in neonates or young animals that may have been deprived of adequate oxygen, such as during the birthing process or if there have been complications in their early development.

The other options, while relevant in different contexts, do not address the immediate need for respiratory support. Atropine is primarily used as an anticholinergic agent to increase heart rate and reduce secretions, but it does not stimulate respiration. Acepromazine is a tranquilizer and would further depress the central nervous system, which is not suitable in cases of inadequate breathing. Lidocaine is an antiarrhythmic medication used for heart conditions and does not have any role in stimulating respiration. Thus, Dopram is the appropriate choice for a puppy that is not breathing adequately.