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The Daily Vet by petMD

The Daily Vet is a blog featuring veterinarians from all walks of life. Every week they will tackle entertaining, interesting, and sometimes difficult topics in the world of animal medicine – all in the hopes that their unique insights and personal experiences will help you to understand your pets.

Seasonal Pet Health Hazards Associated with Fall

Fall is one of my favorite seasons. I fondly recall the sensations associated with brisk autumn temperatures, the aromas of drying plants, and the variety of colors bursting from withering leaves, all of which I experienced while living on the East Coast. Now that Southern California is my home, fall’s climate and vegetation changes are more subtle, yet still highly regarded.


Although many of the seasonal changes associated with fall have great appeal for people, they also present many potential health hazards for our pets, about which owners must be aware.


Dangers Due to Decreased Hours of Daylight


Most peoples’ lives are so busy that we wish there was an extra hour in each day to manage our responsibilities. Therefore, losing an hour of day light when our clocks fall back in observance of Daylight Savings Time’s completion can be frustrating.


Fewer hours of daylight and evening’s earlier start means that we are partaking in many of our daily activities when visibility is poor. Dog owners end up walking or exercising their canine companions in the darkness of early morning or evening.


Reduced light makes it more challenging for drivers to see animals (and people) in driveways, sidewalks, and roads. Having worked in emergency veterinary practice for many years, I've observed an increase in the trend of both dogs and cats suffering injuries after being hit by a car during daybreak or twilight hours.


If you walk your pooch or permit your feline companion to venture outdoors, maintain close observation and control by using a leash and collar or chest harness. Have your pets wear up-to-date tags and implant a microchip to improve their likelihood of a safe return should they go missing.


Dangers Due to Leaves


The pleasure associated with observing the colors of fall quickly dissipates upon embarking on the laborious job of cleaning up a seemingly endless supply of leaves.


The startling noises created by leaf blowers may drive your pets into seclusion or cause them to flee your property. Additionally, gas powered devices can leak fuel or oil, which creates a source of toxicity should ingestion occur when your pet licks a substance from the ground or their paws.


Leaf piles remaining on your lawn quickly accumulate moisture, which promotes bacterial and mold growth. If your pet ingests these microorganisms, digestive tract upset (vomit, diarrhea, decreased appetite, etc.) could ensue.


Dried leaves and other plant material may be burned as part of fall’s clean up, thereby releasing smoke and plant based oils (poison ivy, etc.) that can irritate your pet’s eyes, nose, throat, lungs, and skin.


The safest practice is to keep your pets confined indoors, separate from your yard work.


Dangers Due to Plants and Mushrooms


The Chrysanthemum (mum) is a seasonally blooming flower that is commonly associated with fall. Toxicity can occur if your dog or cat ingests the mum's flower, stems, or leaves, all of which can cause the following clinical signs:

  • Ataxia (stumbling)
  • Dermatitis (skin inflammation)
  • Ptyalism (increased salivation)
  • Vomit
  • Diarrhea


Other plants producing blooms with a toxic potential for dogs and cats include: 


Mushrooms can also appear in our yard or other nitrogen rich material (mulch, etc.). Fortunately for our companion animals, most wild-growing mushrooms are non-toxic. Differentiating a toxic from a non-toxic mushroom is quite challenging, so it’s best to prevent their consumption by your pet. The Amanita phalloides (death cap) causes severe liver toxicity if ingested.


Dangers Due to Rodenticides


Fall’s cooler temperatures drive rodents in search of shelter from the cold and into our homes. Rodenticides (poisons which kill mice, rats, and other creatures) can help deter vermin infestations, but rodenticide ingestion also causes life threatening toxicity to both dogs and cats. Brodifacoum, the active ingredient in D-Con and a common rodenticide, is an anti-coagulant that inhibits Vitamin K’s normal function in the blood clotting cascade. Within one to seven days post-ingestion, blood fails to properly clot and the following clinical signs occur:

  • Lethargy
  • Decreased appetite
  • Pale mucous membranes (gums)
  • Increased respiratory rate and effort
  • Bruising
  • Bloody feces
  • Black, tar-like stools (from digested blood)


Other varieties of mice and rat poisons can contain Cholecalciferol (Vitamin D3), which causes kidney and liver failure, muscle weakness, seizures, and death.


As mice and rats can transport chunks of rodenticide from a container to a location that is accessible to other animals, it’s best to hire a professional service to address your rodent problem instead of putting down easily accessible commercial poisons.


With suspected or known toxicities, immediately contact your veterinarian or emergency veterinary hospital. Additional resources include the ASPCA’s Poison Control Center (888-426-4435) or Pet Poison Helpline (855-213-6680).


Has your pet experienced any fall associated injuries or illnesses? Hopefully not. But if you do have experience with fall hazards and your pet, please share your story in the comments section.



Dr. Patrick Mahaney


Image: Cardiff in the fall leaves, by Dr. Mahaney

Comments  4

Leave Comment
  • Reflections
    11/13/2012 11:49am

    What are your thoughts to putting reflective vests on dogs when walking them?

  • 11/15/2012 07:28am

    I am an advocate of the harnesses, colors, and leashes that we use on our pets (mostly dogs, yet the same principles can be applied to indoor/outdoor cats) I think some sort of reflective nature that permits them to be more easily visualized under the lights of an incoming car during evening hours.
    For Cardiff, we primarily walk him using a really useful harness called the Walk In Sync (http://dogwalkinsync.com), which has small, rectangular reflective emblems on the snaps that keep the harness in place.
    The better anybody can see your pet, the less likely it is they will incur trauma that could be otherwise avoided.
    Thank you for your comments.
    Dr. PM

  • Reflective gear, or light
    11/14/2012 05:07am

    My neighborhood can be pitch black at night. There are no street lights or sidewalks. At night I walk my dog with a small flashing light (designed for bicycles) on the leash handle and on the dog's collar. The two lights flash at different rates and are at different heights. Once a neighbor who was taking out his garbage stopped at the end of his driveway and waited for us to come close. As he peered into the darkness he said "I saw you. I didn't know what you were, but I saw you." All he had seen were two lights flashing in the dark. I think it's better to be the light source than to depend on a light hitting a reflective surface. Cars slow down when they see two bouncing lights moving along the street.

  • 11/15/2012 07:30am

    Thank you for offering your helpful suggestion.
    I have not personally seen the lighting set up that you describe, but it sounds very ingenious and serves as a good suggestion for other readers of this column.
    It's great to hear that you are taking such measures to help to reduce the likelihood your pets will incur any form of trauma during their walks in the evenings.
    Hopefully, I will see you back again on my Daily Vet page.
    Dr. PM

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