Limes do not contain anything that could be considered toxic for dogs.
Even though limes are not poisonous for dogs like some other types of food, you should not feed them to your dogs too much because of the stomach problems they have been known to cause.
Limes are a highly acidic fruit, which means that even animals like dogs can respond poorly to them. If you feel the need to give your dogs limes because they enjoy the taste, you will want to consider their overall health and limit just how much they consume.
http://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants/lime
You are giving potentially dangerous and incorrect information.
Please research better before making such statements. the ASPCA does list all citrus fruit, limes, lemons, oranges, grapefruit etc. as toxic to dogs and cats. While not fatal, they certainly can cause intense reactions of diarrhea and vomiting.
It all depends on what your definition of ‘toxic’ is and on the amount of lime the dog consumes. It won’t kill your dog but it could cause some problems, as I mentioned in the article. So while it’s indeed better to not let them eat it, I’m sure it won’t be a problem if a dog would eat a slice of lemon from you drink. But in case of doubt, always contact your vet!