Switching careers after more than a decade was a daunting undertaking for Melissa Walsh. 

Her career change from social work to veterinary medicine involved four years of classes, labs, clinical rotations — and more. 

"As an older student, I was … basically everyone's mom, age-wise," Walsh told CBC Mainstreet host Steve Bruce. 

"There was a little hesitation, but at the same time it sounded like a great adventure and I wanted to try it."