It won't harm the plants. What kind of damage was done to the tomato plant leaves? I'd be surprised if it were rabbits eating them, as tomato leaves are somewhat toxic.
"I asked a veterinarian friend about the tomato toxicity problem, and here's what she had to say.
Question: Are tomato leaves toxic to rabbits?
Answer #1: Possibly. Tomato plants contain tomatine, an alkaloid glycoside, that yields tomatidine when hydrolyzed. These are similar to solanine, which can be a gastrointestinal irritant and cholinesterase inhibitor. However, the tomatidine is poorly absorbed and appears to be of low toxicity. On the other hand, there have been reports of deaths in pigs and cattle grazing on tomato plants. So best to avoid tomato leaves in any animal.
Answer #2:The Solanacea or nightshade/potato family is of considerable economic importance as it includes potatoes, tomatoes, eggplants, cayenne peppers, tobacco and belladonna.
> The cultivated tomato contains alpha-tomatine. It is found throughout the plant, but especially in flowers and leaves. Concentrations are also high in young, green fruit, but decline markedly during ripening. Tomatine can be weakly cardiotoxic, but is poorly absorbed.
> The highest clinical concern for tomato plants is herbivores eating large amounts of leaves"
https://rabbittalk.com/should-rabbits-ea ... t4411.html
that's not to say that they couldn't eat them or that it would kill them, but animals tend to stay away from stuff that makes them sick.
They always say putting cayenne pepper on your birdseed will keep the squirrels from eating it. Maybe we didn't use enough, but anyway it didn't work.