(she has been treated with Advocate to cover fleas and mites)Did the pup actually have confirmed fleas or mites?
NOAH Compendium - Advocate"The use of the product may result in transient pruritus in the animal. On rare occasions greasy fur, erythema and vomiting can occur. These signs disappear without further treatment. The product may, in rare cases cause local hypersensitivity reactions. The product may in very rare cases cause at the application site a sensation resulting in transient behavioural changes such as lethargy, agitation, and inappetence."
Friends of mine used this on their dogs, and the dogs lost all coat around the site of the application, along their backs, and down their sides, and the skin looked burned, it was also very sensitive to touch etc. Took around 8 months of medication before signs of regrowth were seen :-(
If this drug combination can cause vomiting, I see no reason why it couldn't also cause diarrhoea ?
You also dosed with Panacur for 3 days?
Advocate Spot on - UsesAdvocate covers intestinal worms, so I would question whether there was any need to give Panacur as well?
What advice were you given regarding giving Panacur as well as Advocate?
Personally, my first reaction to runny bums in pups and adults, after the initial starving (resting the digestive system) is to add a spoonful of Bio Yoghurt to their food. I find it sorts out most runny bums without need for antibiotics etc ;-)
However, I too prefer an experienced farm type vet rather than the small animal vets. They do seem to have more diagnostic skills without recourse to the "lets try every expensive test known to man" approach.
Regarding finding a vet who is willing to discuss with you, I find it takes a couple of conversations with a new vet, and asking some knowledgeable questions, before they realise I may have something to contribute to the treatment options ;-)