In 2005 the Conservative leader Michael Howard was accused of running a dog-whistle campaign. Issues like immigration, crime and Europe that got attention simply by being raised. A sharp peeep that got the core support dashing to his side. Or that was the plan.
The approach was largely discredited, but at a fringe meeting last night I was struck by how Conservatives react with the alacrity of a doberman on heat when they get the faintest scent of a policy they like.
The fringe was animal related: the RSPCA Beer and curry reception. They queued around the block for a free supper, in fact people were turned away, so you get an idea of the appetites in the room.
Before the poppadoms were shared out they had to listen to the speeches, and there was a huge cheer for one idea: the suggestion that dog licences should be brought back.
It's a long running, and rather forlorn campaign now. But something resonated.
Was it the echo of a bygone time, when a little old lady would queue at the Post Office for the warm comfort of knowing her dachsund was legal?
Or perhaps the implicit crack down on hooded council estate yobs, no doubt using their mastiff for part-time fighting, when it wasn't dirtying the local park.
Whatever the reason the Agriculture Minister (their minister, of course) looked rather startled.
And when Jim Paice took the microphone he quickly tried to put things straight.
"We are not a government that reaches automatically for regulation to change things. Regulation reaches all those doing the job properly before it reaches the small minority of offenders."
It was a rebuke to the audience, and there was more.
He could not back the dog licence call, or anything that added to legislation without good cause. Rather than the collar and lead - he preferred a nudging stick.
"We want farmers to raise welfare standards voluntarily, and we believe they can be trusted to do so. We are not talking about lowering standards. It is in the coalition agreement that we will aim for the highest possible welfare standards."
At the mention of the C word there was some restlessness. Perhaps the room would rise up, demanding the return of dog licences, a cap on the number of poodles allowed into the country, criminals forced to pay back the community with dog-walking...
So Paice played his ace. "We must improve food labelling. People buying British must know they are buying British."
That did it. Job done. The crowd were once again soppy labradors rolling around and waiting for their tummies to be tickled some more.