GO2Altitude Equine Hypoxic Training Systems (hypoxicators)
Drug-Free Performance enhancement equipment
http://www.go2altitude.com/horse.html

Royal Veterinary College, EquineHospital
http://www.equinehospital.net/

Nature Vet Australia
http://www.naturevet.com.au/

Equine Research Park
http://web.vet.cornell.edu/public/cuerp/

Equine Respiratory system.
http://www.animalherbcompany.com/articles/horse_cough.htm

Equine respiratory system
http://vetgate.ac.uk/browse/cabi/21744d0b938b85ce6b28c668264523e7.html

Products Veterinary Medications
http://www.horseweb.com/links/Products/Veterinary/index1.htm