"Christmas Eve Services" joke

Just before the start of the Christmas Eve Service, the minister
suddenly drops dead. Everyone looks around to see who will
conduct the services with a full house in attendance.
The president of the congregation looks at the vice-president and
as they try to decide what to do, from the back of the room Jack
the Junk Dealer yells out "I have a fantastic dog that sings
hymns, gives the best sermons you could ever hope to hear and
brings people to tears of joy."
With limited possibilities at the moment, they decide to give him
a try.
Up he goes to the pulpit and before you know it, the entire church
is crying with happiness. Now I have to admit it's a bit unusual,
but the fact is the members were happy and isn't that what
Christmas is about anyway?
Anyway, following the service, the president calls over the dog's
owner and offers to give him a contract until the minister can
be replaced. Just as they are about to sign, a large dog comes
running in, grabs and carries off the "new preacher".
"I don't understand" says the president.
"Oh, it's simple, really." Jack responds, "That's his mother. She
wants him to be a doctor."