The index finger of the non-dominant hand is inserted into the vaginal orifice and the urethral orifice is palpated on the anterior vaginal wall.
If they are superficial they can usually be easily palpated.
To achieve this block the foot is held up, and the palmar vessels are palpated over the palmar aspect of the sesamoid bones.
Schedule an appointment with your vet for this day and ask to have your bitch palpated.
Internal organs are palpated, or felt from the outside, to determine if they are enlarged.