The author of Furry Friends effectively supported the claim with many things.
For example, they directly quote from sources for research, giving statistics and facts while still giving credit. They also gave personal feedback and how they think, which gives a persuasive effect. Lastly, they gave reasons for their claims and why they believe in the way they do.
Racism still exists in South Africa today. It is largely racism from Black People towards White People. It is a serious issue in South Africa even though it is not spoken of a lot.