Lethargic pets and possible causes

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Lethargic pets and possible causes

Dear Cathy,

In response to a letter from Emma about her lethargic dog, Dorie, what about depression? Can’t dogs get depressed? My border collie was treated with a short trial of antidepressants and it was quite helpful. He is a rescue and very atypical of his breed; not energetic and intense, like they usually are.

– Sonia, Tucson, Arizona

Dear Sonia,

Both dogs and cats can suffer from depression, which is usually the result of situational circumstances, like a death in the family, or changes to their living situations, like a move to a new home or kids leaving for college. Certainly, as a rescue dog, Dorie may be mourning her past life, but it’s been eight months and most dogs would have warmed up to the new owner by now.

Some of the clinical signs of canine and feline depression include loss of appetite, lethargy and sleep disturbances, which also can be signs of other illnesses. Susan in Great River, New York, suggested Dorie might have heartworm since it is prevalent in South Carolina. Hopefully, Emma’s family will find out what’s wrong with Dorie soon. Lethargy is not normal in a cat or dog.  

Cathy M. Rosenthal is a longtime animal advocate, children’s author, syndicated pet columnist, and pet expert with more than 30 years in the animal welfare field. Send your pet questions, stories and tips to moc.tidnuptepobfsctd-93c85b@yhtac. Please include your name, city, and state. You can follow her @cathymrosenthal

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Cathy Rosenthal (aka The Pet Pundit), CHES, CFE

Animal Welfare Communications Strategist, Writer & Educator

Cathy M. Rosenthal is an award-winning humane educator and author, animal welfare strategist, pet columnist, and speaker who has spent more than 38 years working in animal welfare with local and national humane organizations. She helps people better understand and care for animals through her nationally syndicated My Pet World column and has been the longtime pet columnist for the San Antonio Express-News since 2003.

In addition to her writing, Cathy develops humane education, leadership, customer service, and compassion fatigue training programs for animal welfare organizations nationwide, and has helped raise millions of dollars through grant writing, strategic communications, and program development.

Cathy is the editor and curator of Humane Perspectives: Leadership in Animal Welfare and is the author of several books, including Grant Writing Boot Camp for Animal Advocates, The Lucky Tale of Two Dogs, and The Happy Tale of Two Cats, which was the 2026 winner of the Association of Professional Humane Educators’ (APHE) "Educator’s Choice Award" for Best Humane Education Book for Young Children. She also received the 2026 APHE Nathania Gartman Heroes Award for Impact in Humane Education. Her humane education programs in Texas have reached more than 45,000 elementary school children since 2019.

She resides in Texas with her husband, their cat Sterling, and a former community cat, Maddie, who successfully negotiated an indoor living arrangement but still considers human affection highly negotiable.

Humane Perspectives: Leadership in Animal Welfare is on Sale Now! Special website-only price for a limited time! Order your copy today.

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