Aloe Vera (Liliaceae - causes diarrhea in dogs) Almond (vomiting, painful abdomen, diarrhea) Amaryllis - (vomiting, pain in abdomen, tremors, heart issues, respiratory problems, lethargy, excessive salivation - can be fatal) American Yew (vomiting, painful abdomen, diarrhea) Andromeda Japonica; Angel's Trumpet (toxicity varies by dog, causes vomiting and nausea) Angel Wings (can be fatal, nausea and vomiting) Anemone; Apple (seeds are toxic since they contain cyanide, can cause shock ...