Q. Just how toxic is the Lantana plant to dogs? In Arizona it is is commonly used by landscapers who don't feel it's poisonous to pets. (Esp dogs/puppies
A. Yes , it is toxic to all animals . I did research it a bit as I was not too familiar with the plant .Youu need 1% more than the animal weight to be toxic.
Animals in pastures with sufficient forage will often avoid Lantana, perhaps because of its pungent aroma and taste, but animals unfamiliar to the plant may ingest enough to affect them. Fifty to ninety percent of animals newly exposed may be affected. Foliage and ripe berries contain the toxic substances with the toxins being in higher concentrations in the green berries. Species affected include cattle, sheep, horses, dogs, guinea pigs, and rabbits (Ross, Ivan A. Medicial plants of the world. Totowa, N.J.: Humana. 1999. p. 187.)
The major clinical effect of Lantana toxicosis is photosensitization, the onset of which often takes place in 1 to 2 days after consumption of a toxic dose (1% or more of animal's body weight).