How Class IV Lasers Evolved

The evolution of the Class IV therapeutic lasers have worked wonders for the veterinary industry.

Technicians use a Class IV laser to administer therapy to this dog’s pyotraumatic dermatitis. (Courtesy of LiteCure)

Class IV therapeutic lasers are about 50 times more powerful than Class IIIa or IIIb lasers, which were first to enter the market, says John Godbold, DVM, of Stonehaven Park Veterinary Hospital in Jackson, Tenn., a 30-year practitioner.

“The Class III can be used on the same procedures, but takes more time to perform treatments and may not reach the same tissue depth as the Class IV laser,” Godbold says.

The important parameters for successful laser therapy are wavelength and output power, according to experts.

“Higher power lasers—Class IV, with optimal wavelength for penetration, allows for an optimal treatment dosage in a reasonable treatment time,” says Brian Pryor, Ph.D., president of LiteCure, manufacturer of the Companion Therapy Laser.

“A therapy laser using 5 or 6 watts of output power can perform effective treatments for companion animal disorders in 5 to 10 minutes.

The Class III therapeutic laser technology can reach deeper tissue, but the length of time to reach desirable results can be prohibitive in a clinical environment.

“By having a large spot size and a larger amount of power, the user doesn’t have to be as anatomically precise and can treat a broader area, increasing the rate of success. Unlike Class IV surgical lasers, Class IV therapeutic lasers use a large laser spot size, ~15 mm in diameter, which spreads out the energy, allowing for safe and effective treatments.”

Veterinarians who have been using Class IV lasers cite ease of use, minimal time to operate and low stress for patients.

“I’ve had a Class IV laser in the practice for about a year, and I’m learning a new way to use it every week,” says Dennis Woodruff, DVM, of Avondale Veterinary Healthcare Complex in Des Moines, Iowa..

“We are at the beginning of something that will be very big. I predict half of all veterinary practices will have therapeutic lasers within the next five years.”


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