The primary therapeutic use of activated charcoal in veterinary practice is to:

Activated charcoal is primarily used in veterinary medicine as an adsorbent to prevent systemic absorption of toxins from the gastrointestinal tract. Its mechanism of action relies on its large surface area, which allows it to bind to various substances, including drugs and poisons, effectively preventing these toxins from being absorbed into the bloodstream. When administered after an animal has ingested a toxic substance, activated charcoal can significantly reduce the amount of toxin that enters the systemic circulation, thereby mitigating the potential toxic effects.

The other choices do not accurately reflect the primary therapeutic use of activated charcoal. Neutralizing stomach acid is typically the role of antacids rather than activated charcoal. Supporting liver metabolism is not directly related to activated charcoal's function, as it does not enhance liver function but rather aims to decrease the absorption of toxins. Providing nutrition is not suited to activated charcoal, as it is not a nutrient source; instead, its purpose is specifically to bind and adsorb harmful substances in cases of poisoning or overdose.