Aggression related to being petted is very common in cats. Cats with this type of aggression suddenly scratch, growl, or bite while they’re being petted.
 
The most likely explanations for petting-related aggression are that the cat is overstimulated, has a low tolerance for being touched, or is trying to exert some control over the interaction. It’s also possible that the cat has a medical problem (for example, pain caused by arthritis or dental disease). Any type of aggression, especially if it’s a new behavior, warrants an examination by a veterinarian.
 
The people most at risk of injury are children and others who don’t know the signs that a cat is uncomfortable with an interaction. Tolerance to petting varies from cat to cat, and the same cat’s tolerance can change according to the circumstances.
 
To help people understand the best way to interact with cats, a team of researchers in the United Kingdom developed a set of guidelines that they describe with the acronym CAT (for choice, attention, and touch).[1] The team found that cats showed less aggression when people followed the CAT guidelines during interactions.
 
The gist of the CAT guidelines is that we should handle cats the way they want to be handled and leave them alone when they want to be left alone. Makes sense, right? However, in another study, the same team found that some people who had lots of cat-owning experience and rated their own cat knowledge as high interacted in ways the cats did not want.[2]
 
The following is a summary of the CAT guidelines, or how to pet a cat.
 
C: Give the cat choice and control.

• Stay in one place and offer your hand to the cat. Let the cat decide whether to approach you and interact.
• If the cat rubs against you, it’s OK to pet the cat. If the cat doesn’t rub against you, don’t pet the cat.
• If the cat walks away from you, don’t follow.
• When you’re petting a cat, pause every few seconds to let the cat choose whether to continue. If the cat doesn’t rub against your hand when you pause, don’t keep petting the cat.

 
A: Pay attention to the cat’s body language.
These are signs that a cat might not want to be petted any longer:

• Turns head away from you
• Moves away from you
• Flattens ears or rotates ears backward
• Shakes head
• Fur on the back makes a rippling movement
• Licks nose
• Grooms self for just a few seconds
• Stops purring or rubbing against you
• Turns head sharply toward you or your hand
• Twitches tail vigorously

 
T: Touch the cat only where the cat wants to be touched.

• Areas that are OK with most friendly cats: top of head, base of ears, side of face, under chin
• Areas that are not OK with most cats: belly, base of tail
• Areas that might or might not be OK (watch the cat’s body language): back, sides, legs, tail

 
To read more about cat-friendly petting and how humans interact with cats, check out these 2 articles:

• “Why Petting Can Make Some Cats Aggressive,” by Zazie Todd, PhD (Psychology Today website, June 29, 2021): https://www.psychologytoday.com/us/blog/fellow-creatures/202106/why-petting-can-make-some-cats-aggressive
• “Do People Know How to Pet Cats?” by Mikel Maria Delgado, PhD (What Your Cat Wants website, October 2, 2022): http://whatyourcatwants.com/do-people-know-how-to-pet-cats

 
References
1. Haywood C, Ripari L, Puzzo J, Foreman-Worsley R, Finka LR. Providing humans with practical, best practice handling guidelines during human-cat interactions increases cats' affiliative behaviour and reduces aggression and signs of conflict. Front Vet Sci. 2021;8:714143. doi:10.3389/fvets.2021.714143
2. Finka LR, Ripari L, Quinlan L, et al. Investigation of humans individual differences as predictors of their animal interaction styles, focused on the domestic cat. Sci Rep. 2022;12(1):12128. doi:10.1038/s41598-022-15194-7
 
Photo by Ilze on Unsplash

Some decorative winter holiday plants pose risks to pets. Other plants that aren’t actually toxic can still cause upset stomach if an animal swallows them.
 
If you think your pet might have swallowed or been exposed to a toxic plant, contact your veterinarian, an animal emergency clinic, or a 24-hour animal poison control hotline (a fee may apply):

• ASPCA Animal Poison Control Center: 888-426-4435
• Pet Poison Helpline: 855-764-7661

 
Amaryllis (Amaryllis species)
Ingestion of amaryllis leaves, stems, or bulbs can cause drooling, vomiting, diarrhea, belly pain, lethargy, and a drop in blood pressure.
 
Christmas cactus (Schlumbergera species)
Christmas cactus isn’t toxic. However, an animal that swallows part of one might vomit or have diarrhea.
 
Christmas rose, hellebore (Helleborus niger)
Hellebores contain cardiac glycosides, compounds that affect heart function. Ingestion of any part of the plant can cause drooling, belly pain, vomiting, diarrhea, and lethargy.
 
Christmas trees
The Christmas trees most commonly grown in North Carolina (firs, pines, cedars, and cypress) aren’t toxic, although like other non-food plants they could cause vomiting or intestinal blockage if an animal swallowed enough of one. The risks to pets are from trees falling, ornaments breaking, exposure to electrical cords, and possibly exposure to preservatives (which are not very toxic but can cause mild vomiting, according to ASPCA Animal Poison Control).
 
Norfolk Island pines and rosemary plants are often sold as potted miniature holiday trees. These two plants aren’t toxic to cats and dogs. However, a miniature tree made of mixed greenery would be a serious danger if it contained yew.
 
Cyclamen (Cyclamen species)
Ingestion of cyclamen, a flowering houseplant, can cause drooling, vomiting, and diarrhea. Swallowing a large amount of cyclamen tubers can lead to heart rhythm abnormalities, seizures, and death.
 
Delphinium, larkspur (Delphinium species)
Blue delphinium flowers are included in some Hanukkah floral arrangements. Toxic compounds in delphinium block a neurotransmitter that’s required for muscle function. Ingestion can cause digestive system problems (vomiting, diarrhea, or constipation), belly pain, drooling, weakness, abnormal heart rhythm, tremors, seizures, and paralysis. The most severe effects—heart or lung failure and death—are most likely to happen in grazing animals that ingest large amounts of the plant.
 
Holly, winterberry, Christmas holly, English holly (Ilex aquifolium)
Ingestion of English holly and similar plants in the genus Ilex can cause vomiting and diarrhea. The pointed leaves can injure the inside of the mouth, leading to drooling and other signs of mouth discomfort.
 
Lily (Lilium species, Hemerocallis species)
Lilies of various types are common in floral arrangements, including arrangements for winter holidays. Some lilies are so toxic to cats that they shouldn’t be brought at all into a house with cats. The most dangerous lilies are Lilium species (Easter lily, Japanese lily, Asiatic hybrid lilies, stargazer lily, Casablanca lily, and tiger lily) and Hemerocallis species (daylily). Ingestion of a tiny amount of plant material—even licking pollen from a paw—can cause kidney injury in cats. Calla lilies, peace lilies, lily of the valley, and Peruvian lilies are not Lilium and Hemerocallis species; these plants don’t damage the kidneys but can cause stomach upset and other problems.
 
Mistletoe (Phoradendron species, Viscum album)
Mistletoe ingestion can cause vomiting, diarrhea, and abdominal pain in animals. Swallowing large amounts can cause low heart rate, a drop in blood pressure, uncoordinated gait, and seizures. American mistletoe (Phoradendron species) is less toxic than European mistletoe (Viscum album).
 
Paperwhite (Narcissus papyraceus)
Paperwhites and other Narcissus species (like jonquils and daffodils) cause severe vomiting and diarrhea if ingested. Swallowing a large amount can lead to breathing and heart rhythm abnormalities. The most toxic part of the plant is the bulb.
 
Poinsettia (Euphorbia pulcherrima)
Poinsettias are not as toxic as some have been led to believe, according to ASPCA Animal Poison Control. The thick, milky sap is an irritant that can cause drooling and vomiting if ingested. The sap can also irritate the skin and eyes on contact.
 
Yew (Taxus species)
Plants in the genus Taxus are highly toxic to all animals, including dogs, cats, horses, and people. Yew branches and berries are sometimes used to make holiday wreaths and other decorations. Be very careful displaying and disposing of items that might contain yew; be sure pets and wildlife can’t access them. Yew ingestion causes vomiting, muscle tremors, difficulty breathing, heart failure, seizures, and death.
 
Sources

• ASPCA Animal Poison Control toxic and nontoxic plants list: https://www.aspca.org/pet-care/animal-poison-control/toxic-and-non-toxic-plants
• North Carolina Extension Gardener plant toolbox: https://plants.ces.ncsu.edu/
• Pet Poison Helpline poisons list: https://petpoisonhelp.wpengine.com/poisons/

 
Public domain photo of yew (Taxus baccata) by MM on Wikimedia Commons