http://www.petpoisonhelpline.com/poison/fertilizers/ Fertilizers

Poisonous to: Cats, Dogs

Level of toxicity: Generally mild to moderate, depending on the amount ingested and concentration of the product

Common signs to watch for:

Drooling Nausea Vomiting (acute or delayed onset) Diarrhea Abnormal posture due to abdominal pain Difficulty breathing “Muddy” colored gums

Most fertilizers […]