Heard this just yesterday
My daughter's dog had arthritis symptoms so bad it acted like it was paralyzed. She took it to her doctor rather than a vet where he said many times the problem isn't arthritis but rather toxins produced by a fungal infection. Dr also said that the fungal infection is enhanced in many dogs by brewers yeast, one of the main ingredients in dry dog food, recommended no more of it for her dog. After a couple days of fungicide tablets and new diet the dog is fine. Said when she went to the pharmacy they gave her a double take since the prescription was made out to Dink.