I need help from someone w/ a green thumb

[RoxMonster]

I am absolutely terrible at caring for plants. They pretty much always die. I either over- or underwater them.

Anyways, I planted some annuals in pots on my patio. One pot is actually thriving really well-they are full and gorgeous. The other pot, which is getting the same care, same amount of sun, etc. is scraggly and looks withered. Upon closer inspection, all the leaves have holes in them, like some type of bug got at them. It's only this pot that has this issue.

Is there a way to salvage them? Something I should pick up at the home improvement store? I would preferably like something non-toxic because I do have a dog and she gets into things even when I am outside keeping an eye on her.

[RoxMonster]

They are pansies and marigolds. I don't have any idea what's eating at them though. I have only been able to see the holes, but not spot any critters.

Thanks for the suggestion! I would have had no idea to use a solution like that.