Final answer:
Steppenwolf formed in 1967 and Three Dog Night formed in 1966.
Step-by-step explanation:
The blues-inspired bands Steppenwolf and Three Dog Night formed in different years.
Steppenwolf was formed in 1967 in Los Angeles, California. They gained popularity in the late 1960s and are best known for their hit song 'Born to Be Wild.'
Three Dog Night, on the other hand, was formed a year earlier in 1966 in Los Angeles. They had a string of successful songs throughout the late 1960s and 1970s, including 'Joy to the World' and 'One.'