I have finally foiled the birds and squirrels with a combination of bird netting and a hunting dog. The squirrels are afraid of Percy. The first day that I put the bird net up 2 birds figured out how to get under it and got stuck. They were screeching and flapping and then Percy tried to attack them (luckily I caught him before he could). Ever since then, the birds just sit on the arbor and look at the net. I have harvested a ton of grape and cherry tomatoes already, and there are hundreds more getting ready to ripen. Some of the grape tomatoes were so big they look more like romas.