My dog just started medicine for Pancreatis. Shes really old, and so this medicine is the last hope for her. The doctors told us to try it for two weeks and if it doesnt work we have to put her to sleep. How long does medicine take (usually) to work for dogs? We started her on it last thursday and shes still feeling ill…
How long does it take for a medicine to get in a dogs body and start working?
June 25th, 2010 
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Some medications take up to 7 -10 days to show any sign that it is working –or not. Give it a little more time.
You have a hard decision to make and I dont envy you.
well med work the same on people it all takes time to work and the right meds help to
hope it helps but just try to remeber she is old