Do vet school admissions take into account undergraduate rigor when evaluating applicants?

If I were to major in engineering and come out w/ a 3.0-3.5ish and a decent MCAT/GRE score, would I stand a chance? Do admissions officers regard the rigor of engineering, or just look purely at your GPA?

They will likely consider the rigor, but only if you make it past the initial numbers screening. Although they may claim that they don’t do this, they will have some undisclosed threshold for GPA and test scores where if you don’t meet that, the remainder of your application is not even going to be looked at.