Warm Welcome

Casey was glad when last week the neighbors finally got home from their summer in Maine. He left a welcome home note taped to their door:

It says:

"Welcome home Wendy, Suzanne, Apu, Gus, Finn, Doley, Oscar, Felix, and Huey."
(Wendy and Suzanne are the human neighbors; the rest are dogs and cats.)

"Treats for everyone!!!!!"
(Casey left them homemade cookies, plus some dog and cat treats.)

The last bit says:

"Dear Apu, Welcome home. I'm so glad you're home because I have a dog friend again. Your friend, Arnold."

Apu is another Australian Terrier. They're from the same kennel and are related somehow. And Arnonld is, indeed, glad that the neighbor dogs (Apu and the others) are home again.