One dog in the "doggie relay" created to transport an autistic boy's pets to his new home in Arizona was tranquilized yesterday morning after becoming aggressive with a volunteer driver.

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Daisy, a yellow 68-pound Labrador retriever, experienced "cage aggression" and started growling and jumping at Pennsylvania volunteer Jenny Webster before the start of the second pass-off in the relay, Webster said.

The situation set the relay back by six hours.

The relay is an effort by volunteers in New Mexico and Pennsylvania to reunite Joshua Kuehn, 12, of McDonald, and his two dogs in Phoenix.

The Kuehns were giving the dogs up for adoption because airlines said they couldn't take them due to high temperatures in the cargo areas, but Webster and others volunteered to drive Trikzy and Daisy to the family's new home.

The tranquilizer, donated by Butler County veterinarian Lori Love, should last six to eight hours, Webster said.

"It's going to be worth it in the end," she said from the road. "I have faith. I don't blame the dog at all."