Hi my 9 months old Shih tzu has a bad habit of eating his own poop we are giving him enough vitamins along with his food it seems like it's because of his behaviour he eats poop please suggest some good and effective medicine to overcome this.

First we would have to understand the reason, if it was deficiency related it should've come down with the supplements. Another reason can be enzymatic insufficiency, you can discuss this with your doctor/ take a consultation on the app and start treatment for this if the other symptoms are matching with the condition. If it is a behavioral issue you have to modify that by correcting the pup when he does this or you can add small amount of pepper powder on it to make it taste bad to discourage this behaviou