Labored breathing refers to difficult or harder-than-usual breathing. It is when a person is having trouble breathing and is making more effort to take in and release air. Full definition
Other symptoms of labored breathing including breathing with an open mouth, noisy breathing, and an extended head and neck (low and in front of the body). (petpremium.com)
Heat prostration is when your pet is lying on their side with labored breathing. (petsmagazine.com.sg)