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