LOS ANGELES — Rachael Ray is looking for 64 charities to compete in a $200,000 contest to find the most deserving pet cause in the country. Using basketball’s March Madness format, Mutt Madness will start with 64 contestants, Ray said. These will be whittled down by Ray and a panel of pet lovers from entries submitted online at www.rachaelray.com/muttmadness by Sept. 30. The champ will be announced in December, Ray said. Her organization, Rachael’s Rescue (www.rachaelsrescue.org), helps at-risk animals through adoption.