niewbie - call methods from another class

Hello, I have something like this: $stmt = $this->_dbh->prepare("INSERT INTO DOG (name_dog, race_dog, id_vet) VALUES (?, ?, ?)"); $stmt->bindParam(1, $this->getNameDog() ); $stmt->bindParam(2, $this->getRaceDog()); $stmt->bindParam(3, ????????????????????); $stmt->execute(); } To make this insert function work, I need to fill the id_vet database column with some values. I cannot use $this->getIdVet() because this method is not in dog class, is on the veterinary class. So my question is: How can I access the getIdVet() that is on the veterinary class to put it on the insert dog method? Thanks a lot, Márcio