Are Mistletoe Berries Poisonous To Animals?

Are Mistletoe Berries Poisonous To Animals? Toxicity to pets Berries from this holiday plant contain polysaccharides, alkaloids, and lectins. When accidentally ingested by our pets, mistletoe poisoning can result in mild signs of gastrointestinal irritation (e.g., drooling, vomiting, diarrhea, abdominal pain). Is mistletoe bad for cats? The symptoms of mistletoe toxicity include gastrointestinal upset (vomiting