... or in my case it was the other way around.
I have been a veterinarian for 30 years but it took me almost 20 of those to eventually make the connection between the companion animals I treated with so much compassion and respect and the ones that found their body-parts on the end of my fork.
It was a dietary change to vegetarianism that got me thinking of our place in the evolutionary tree... having studied all that years ago. Added to that was the fact that I had got quite involved with our local (Roman Catholic) church and the Knights of Columbus. Suddenly I was forced to face the compartmentalization of my knowledge from my belief and something had to give. It's obvious that reason won out, but it was a tough fight for my Christianity-saturated psyche. Once I was able to pull back and take a look at the bigger picture, our inhumanity to other species of sentient beings was obvious.
My story is archived on the HSUS
site after receiving a request to submit a story on how animals had influenced my religious thought. Don't think they were quite expecting my response.