as Sue noted, it is best to first find out what is causing it. Pumpkin will generally help diarrhea if food related but with girardia and coccidia it will not help and this requires medication. Your best bet is to take a stool sample (fresh) to the vet and ask them to check for parasites. The longer the delay the more chance the dog will become dehydrated and could become more of a serious issue.
Good Luck.
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No I am not a Miniature Doberman, I was around 200 years before Louis Doberman created the Dobie and as for my friends the Manx cats, yes they are better at playing fetch than I am, I am a Miniature Pinscher.
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Does anybody know? 
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