Final answer:
If a dog's rectal temperature reaches 105°F on a hot summer day, it is a cause for concern and can indicate heat stress.
Step-by-step explanation:
If a dog's rectal temperature reaches 105°F on a hot summer day, it is a cause for concern and could indicate heat stress. Dogs are vulnerable to heat-related illnesses and can suffer from hyperthermia, which is an elevated body temperature. When a dog's rectal temperature exceeds 103°F, it is considered abnormal and can lead to serious health complications.
Learn more about Heat stress in dogs