I thought the birds were stealing all our grapes until I saw our flat coated retriever in amongst the vines. He was looking carefully through the vines and then found what he was looking for a nice bunch of grapes. He proceeded to down them without looking the slightest bit guilty. He also loves eating fruit from our orchard and so far I have seen him eat plums, apples, peaches, apricots and loquats. My golden retriever will eat apples and loquats but turns his nose up at the rest.
The most effective way to do it, is to do it.
Amelia Earhart
2005 Trek 5000 road/Avocet 02 40W
2006 Colnago C50 road/SSM Atola
2005 SC Juliana SL mtb/WTB Laser V