In large numbers coccidia can lead to gastrointestinal pain, diarrhea, malabsorption and fluid loss. Eventually this can lead to a failure to eat, weight loss, secondary nutritional disorders and bacterial infections. (excerpt from 'The Bearded Dragon Manual' by Philippe de Vosjoli et al)
Without knowing more history about this dragon...hard to say if its health issue is solely due to a flare up of coccidia, or if the flare up is because of the dragon not being in good health. A healthy bearded dragon with proper husbandry and clean environment, naturally keeps levels of coccidia in its system to a minimum and has no ill effects from their presence. However, insufficient heat, UVB, dirty environment (like poop left in the cage for a long time before its cleaned, or water dish isn't cleaned especially after a dragon is sitting in it), stress, improper diet, etc can all cause flare ups of internal parasites.
It is very unusual for a dragon to sit in water, unless the cage is so hot, that is the only place it can cool down in. Unless she has a dragon that for some reason doesn't mind bathing. Either way, I don't think its good for the dragon to sit in water for long periods of time.
Try and get good accurate measurements of the cage temperatures, basking spot (both surface and air temperature) and the cool end. If the cage is really hot, the basking may be due to trying to cool down, especially if there are no hides or cool end for the dragon to go into.
As for yogurt..it shouldn't be fed every day. In the past I had recommended a very small amount of yogurt to serve as a probiotic, but now its easy to get reptile specific probiotics (Check BDLrv's post...I can never remember how to spell it...Aciliphys or something like that). That and in the past I didn't know about diary products being indigestible for dragons. I am not surprised though.
The only way to be 100% sure on whether a dragon has internal parasites, is via a fecal examination. Some vets wont' do this unless they also examine the animal, mostly because they want to get an idea of the overall health etc...and they will need to see the dragon anyway, to weigh it inorder to recommend proper dosage for any medication. Since it sounds like the dragon is now in your care, it will be up to you to bring it to a vet for a proper examination. However, getting it eating regularly and in a proper environment, may make it unnecessary to treat internal parasites, as a healthy dragon can typically fight off the affects themselves.
If you don't have a digital scale, get one and weigh the dragon weekly, maybe even twice weekly to monitor weight loss or gain. IF it eats alot and doesn't seem to gain any weight or continues to loose weight...(note that after bowel movements, some 'weight loss' will occur, if you weigh right after or before it eats again). Probably the best time to weigh is after a bowel movement and before feeding..or same time every morning or evening (after lights out while dragon is sleeping, probably be the less stressful..as most will just lay there once they are not being touched)
One other reason a dragon may soak is to get rid of external parasites. I know snakes will definitely soak if they have mites, not sure if dragons will do that. However to find mites, its easiest to just check the water after it soaks for awhile...if you see small black or dark brown roundish things flowing around, roughly the size of a pinhead...mites are likely the culprit. You can also look for mites on the dragon, under the chin, around the eyes, in the 'armpits' and other skin folds.
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PHLdyPayne
Forum Princess