My memory was that the farm dogs were excluded from the rebellion because they were considered too close to the humans. But I just looked up a plot summary and it talks about “Napoleon’s dogs” repeatedly as enforcers.
Anyway, what had the pig just told the dog that needed this interruption?
Comics I Don't Understand 
The pig might have said something like “According to George Orwell, ‘All animals are equal but some animals are more equal than others‘ (by which he meant ‘us pigs’).“
I thought it might be a local-booster thing, that you tell tourists. “This is the original farm that George Orwell used as a model for the Animal Farm in his book.”
I think Kilby has it. At least “Something about ‘Animal Farm'” for sure.
I figured the pig was talking about Animal Farm as a lead-in to get the dog to help with the revolution. In the book the dogs are loyal, but Napoleon raises their puppies to be his personal guard. Here are the Cliff’s Notes: https://en.wikipedia.org/wiki/Animal_Farm
@ Kilby
} The pig might have said something like “According to George
} Orwell, ‘All animals are equal but some animals are more equal
} than others‘ (by which he meant ‘us pigs’).“
And Winston Churchill said “I am fond of pigs. Dogs look up to us. Cats look down on us. Pigs treat us as equals./i>”