My dog growls and shows her teeth at me.?

Remember this dog isn't feeling well. You will need to correct her AND get her meds into those ears. When you apply the meds, be gentle with her. They (her ears) are painful--but you cannot allow her the "nipping" Get after her, but be gentle with her meds! Praise her after she does a good job with allowing you to apply the drops. Give her a treat and praise when she settles down and after you medicate her. As you already know, Beagles LOVE to eat--use it--- to lessen the struggles of medicating her! It is a simple matter of "bribery"!!!!