"Dog Whisperer" host and best-selling author Cesar Millan says he accomplished one of his biggest goals on Thursday in California.

Millan took the oath to become an American citizen Thursday as his wife and two sons (already U.S. citizens) watched on.

"This is the ultimate culmination of living the American dream," said Millan. "Becoming a U.S. citizen has been a goal of mine since I first came to this great country. I have much to thank this country for, and all of the success it has afforded me and my family, and now I am proud to be a citizen."

Millan passed his citizenship test earlier this year.