The dog Gladys with the female name is obviously a male dog throughout the episode.
Around 14 minutes in, Dr. Hodgins and an FBI team find a bottle of the narrow spectrum antibiotic Erythromycin in the veterinarian's car. Dr. Saroyan confidently states that is it not an "animal drug." However, Erythromycin is commonly used as a prescribed antibiotic for pneumonia, Lyme disease, various infections, and even comes in an ointment for eye infections.
When evaluating three persons as possible victims at about 7:00 min, the second victim is supposedly too tall. However, no height was mentioned and also no information about it is visible on the screen.