The fourth defines what is covered. Emails easily fall under its definitions.
What are the limits of the veterinary law if it isn't specified? And how does anyone know if they are violating it if it isn't defined?
And the PA Veterinary Medicine Practice Act defines what falls under the term "veterinary medicine" and even an idiot like me can see how use of an ultrasound device to determine whether a cow is pregnant or not falls easily within that definition - much more easily than emails fall under the Fourth Amendment.
PA Veterinary Medicine Practice Act, 1974 Act 326, section 3(9):
"Veterinary medicine" means that branch of medicine
which deals with the diagnosis, prognosis, treatment,
administration, prescription, operation or manipulation or
application of any apparatus or appliance for any disease, pain,
deformity, defect, injury, wound, physical condition or mental
condition requiring medication of any animal or for the
prevention of or the testing for the presence of any disease.
"Physical condition" would quite easily include pregnancy, and the determination of whether a cow is pregnant would fall under the rubric of diagnosis or prognosis, and use of an ultrasound as "application of any apparatus".