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Toxic Substances in Feline Companions: Diagnosis, Treatment & Prevention
Toxic Substances in Feline Companions: Diagnosis, Treatment & Prevention

By Dr. Simona Buoncompagni

T

he well-being of domestic cats is increasingly threatened by exposure to various toxic substances present in their environment. These substances, ranging from household chemicals to environmental pollutants, pose significant risks to feline health, necessitating a comprehensive understanding of their sources, mechanisms of action and clinical manifestations.

Understanding the sources and effects of poisoning in cats is paramount for responsible pet ownership and preventative veterinary care. The rise in stress-related illnesses among cats, like lower urinary tract disease and obesity-related diabetes, underscores the importance of meeting their specific needs. However, given the close relationship between humans and their pets, cats can serve as sentinels for environmental contamination, mirroring the potential health risks.1

Sources of Poisoning in Cats
Due to their unique physiology and behavior, cats are particularly vulnerable to certain toxins. Many commonly used household products, such as cleaning agents, insecticides and rodenticides, contain chemicals that are highly toxic to cats. Pesticides are among the leading causes of poisoning in domestic animals, along with drugs and household products.2

Ethylene glycol, found in antifreeze, is notorious for its sweet taste, which attracts animals but can cause rapid kidney failure. Heavy metals, such as lead and mercury, can contaminate the environment through industrial waste and old paint, also posing a risk to cats who may ingest them through contaminated soil or prey.

Certain plants, including lilies, are extremely poisonous to cats, causing severe kidney damage even with minimal ingestion. In addition, wild mushrooms can pose a threat to cats that spend time outdoors.

Pharmaceutical drugs intended for human use or even for other animals can be dangerous if ingested by cats, highlighting the importance of secure storage. Furthermore, improper use of medications, such as pain relievers like acetaminophen or ibuprofen, can result in severe toxicity in cats.

Clinical Manifestations and Diagnosis
The clinical signs of poisoning in cats can vary widely depending on the toxin, dose and route of exposure. Some toxins cause immediate and severe symptoms, while others may have a more insidious onset.

Neurological signs, such as tremors, seizures and incoordination, are common indicators of poisoning, particularly with insecticides and certain heavy metals. Gastrointestinal upset, including vomiting, diarrhea and loss of appetite, can occur with a wide range of toxins, including household cleaners, toxic plants and certain medications.

Respiratory distress, characterized by rapid or labored breathing, can result from exposure to irritant gases or toxins that affect the respiratory system. Liver damage, indicated by jaundice, abdominal pain and elevated liver enzymes, can be caused by toxins such as acetaminophen and certain types of mushrooms.

Kidney failure, a common consequence of poisoning, can manifest as increased thirst and urination, followed by decreased urine production and lethargy. Metal toxicosis in general has gastrointestinal upset as a common feature of acute toxicosis. Clinical manifestations of poisoning vary widely, necessitating a thorough diagnostic approach.

Diagnosing poisoning in cats often requires a combination of history, physical examination and laboratory testing. A thorough history, including potential exposure to toxins, is crucial in narrowing down the list of possible causes. Physical examination findings can provide valuable clues, but they are often nonspecific.

Laboratory tests, such as bloodwork and urinalysis, can help assess organ function and identify specific toxins. Specific tests, such as blood lead levels or ethylene glycol testing, may be necessary depending on the suspected toxin.

It is important to obtain full details of the poisoning agent. Unfortunately, if there is no accessible or valid laboratory method available to detect the chemical in biologic or environmental specimens, the case will never be confirmed and will remain either in the suspected or probable category.

orange vector outline of a cat beside spilled bottles

Using toxicological diagnostics can impact clinical decision making, while supportive care stabilizes the patient and prevents further complications.

Treatment Strategies
Effective management of feline poisoning requires prompt and aggressive intervention. In addition, an organized and individualized approach to patient assessment and management is the ideal way to provide the best emergency care.3 Using toxicological diagnostics can impact clinical decision making, while supportive care stabilizes the patient and prevents further complications.

Decontamination is a critical first step in many cases of poisoning. Emesis (induced vomiting) can be useful in removing ingested toxins from the stomach, but it is contraindicated in certain situations, such as when the animal is unconscious or has ingested a corrosive substance. Activated charcoal is frequently administered to absorb toxins in the gastrointestinal tract, preventing further absorption into the bloodstream.

Intravenous fluids are administered to maintain hydration, support kidney function and help eliminate toxins from the body. Antidotes are available for certain toxins, such as vitamin K1 for anticoagulant rodenticide poisoning and N-acetylcysteine for acetaminophen toxicity. Antidotes act by four predominant mechanisms: direct action on the toxin, which involves specific and nonspecific binding, and enhanced elimination.

Symptomatic treatment is aimed at controlling specific symptoms, such as seizures, vomiting and pain. Maintaining the balance of electrolytes and acid-base is vital for the stability of poisoned patients.

Chelation therapy has been proven beneficial for some heavy metals, including lead and mercury, and has become the mainstay of treatment for acute poisoning with these metals.4 The decision to treat with antivenom depends on factors such as cytotoxic swelling, active bleeding or symptomatic weakness.

The increasing use of herbal medicine in both humans and animals has introduced phytotoxins as a potential source of poisoning.5 Environmental toxins like snake, wasp and bee venom can also induce toxic effects.

Extracorporeal therapy, which includes hemodialysis, hemoperfusion and therapeutic plasma exchange, is a treatment modality that removes drug or toxin from the blood using an artificial kidney. The use of extracorporeal treatments in veterinary medicine is rapidly expanding, and their use should be strongly considered in cases of severe poisoning.

Prevention
Prevention is paramount in reducing the incidence of poisoning in cats. Pet owners should be educated about common household toxins and the importance of secure storage. Toxic substances can be ranked as super toxic, extremely toxic, very toxic, moderately toxic, slightly toxic, and practically nontoxic or relatively harmless. Cats should be kept indoors or supervised outdoors to prevent exposure to poisonous plants, pesticides and other hazards.

Early recognition of clinical signs and prompt veterinary care are essential for improving outcomes in feline poisoning cases. In addition, raising public awareness can further reduce the incidence of poisoning and improve the well-being of feline companions.

References:
  1. Pocar, P., Grieco, V., Aidos, L., & Borromeo, V. (2023). Endocrine-Disrupting Chemicals and Their Effects in Pet Dogs and Cats: An Overview. Animals, 13(3), 378. Multidisciplinary Digital Publishing Institute. https://doi.org/10.3390/ani13030378
  2. Bertero, A., Rivolta, M., Davanzo, F., & Caloni, F. (2020). Suspected environmental poisoning by drugs, household products and pesticides in domestic animals. Environmental Toxicology and Pharmacology, 80, 103471. https://doi.org/10.1016/j.etap.2020.103471
  3. Al‐Jelaify, M., & AlHomidah, S. (2021). The Individualized Management Approach for Acute Poisoning. Advances in Pharmacological and Pharmaceutical Sciences, 2021, 1. Hindawi Publishing Corporation. https://doi.org/10.1155/2021/9926682
  4. Knight, A., Zhou, E. Y., & Francis, M. B. (2015). Development of peptoid-based ligands for the removal of cadmium from biological media. Chemical Science, 6(7), 4042. https://doi.org/10.1039/c5sc00676g
  5. Nwaji, A. R., Arieri, O., Anyang, A. S., et al. (2022). Natural toxins and One Health: a review. Science in One Health, 1, 100013. Elsevier BV. https://doi.org/10.1016/j.soh.2023.100013
Simona Buoncompagni headshot
Simona Buoncompagni, DVM, DACVIM, serves as a distinguished Clinician specializing in Internal Medicine, Urinary Diseases, Ultrasound, and Extracorporeal Therapies at LeadER Animal Specialty Hospital in Boca Raton, Florida. Her journey in veterinary medicine began in her native Italy, where she graduated from the School of Biosciences and Veterinary Medicine at the University of Camerino in 2002. Dr. Buoncompagni later earned a Master’s Degree in Gastroenterology and Endoscopy for Small Animals from the University of Veterinary Medicine of Teramo, then completed a Small Animal Internal Medicine Residency at Oklahoma State University. Her commitment to excellence is reflected in her ACVIM Board Certification in Small Animal Internal Medicine and her Hemodialysis Certification from the University of California, Davis.
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