Veterinary Drug Handbook (VDH) is the reference veterinarians turn to when they want an independent source of information on the drugs that are used in veterinary medicine today.


Of a long duration: a chronic illness persists for weeks, months, or even for the life of animal. See also acute. Exposure to the poison occurs over a period of weeks, months, or years; onset of signs may be sudden and dramatic, or can be insidious like a slow loss in body condition or reduced productivity. A disease or condition that has been present for several weeks or longer.

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