The show centres on Dr Jeff Young and his staff at Planned Pethood Plus as they take care of animals in need.
The series will have its fourth season premiere on September 30, according to The Hollywood Reporter.
Produced by Double Act, "Dr Jeff: Rocky Mountain Vet" is Animal Planet's most-watched series of 2017.
In the new season, Jeff and his team will travel to international locations, including Mexico and Romania to provide medical services to animals in need.