The shampoo should be fine as long as your bully is not allergic to any of the ingredients. I prefer the medicated because of it's ability to remove yeast and bacteria.
Bathing should be done as needed. Some bullies need it more often than others. For example, I give Molly 2 baths for each bath most of my bullies have. For her, it is every 2-3 weeks. Mandy gets it a bit more too but she is all white and likes to chase lizards so she gets "dusty". Otherwise, the rest go about a month or longer in between depending on their smell. Yuna never even seems like she needs one when I give her one but she is a prissy girl who never gets dirty lol
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