Someone said that to us the other day.
Did not like black dogs and especially not labs, it was a tiny thing on a lead growling at our dog as we walked past them.
Someone we know had a dog that did not like black people, that was awkward.
Uncles dog was scared of cows as it got zapped by an electric fence with cows right on the other side so blamed the cows. Its real easy for animals to get a fear of random things.