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Symptom: Hair Loss - Why is my dog or cat losing their hair?

Signs my pet is suffering from hair loss  

  • Local or widespread baldness   

  • Thinning haircoat  

  • No significant itch 

  • Reddened skin 

  • Red raised bumps 

  • Scabs or crusts on the skin 

  • Bleeding or discharges from the skin 

  • Ulcer 

Symptom: Hair Loss - Why is my dog or cat losing their hair?

'My pet is losing their hair' - Frequently asked questions

What are the common reasons that my pet is losing their hair?

- Skin infections (bacterial or fungal)  

- External parasites (fleas, ticks, lice, mites/mange such as Demodetic or Sarcoptes, mosquitos)    

- Environmental (atopic dermatitis)

- Autoimmune diseases (pemphigus, lupus)

- Hormonal imbalance (Cushing, Ipothyroidism diseases)

- Skin cancer 

DOs - What can I do at home if my pet is losing their hair?

- High-quality proteins diet 

- Omega 3 & omega 6 fatty acids 

- Special hypoallergenic diet, if allergy is suspected 

- Gentle brushing and medicated shampoo (if the diagnosis is reached by your vet) 

- Parasitic control prescribed by your vet 

- Reduction of stress by providing the same stable routine, exercises and mental stimulation 

DON'Ts - My pet has hair loss - What I shouldn't do at home

- Don't self-medicate and never give your pet human medication 

- Don't use human soaps or shampoos, they are too harsh for your pet's skin  

- Don't bathe your pet too frequently as excessive bathing can strip the natural oils from their coat 

- Don't ignore stress as a factor. Stress and anxiety can cause a pet to excessively lick or groom themselves, leading to hair loss 

My pet has hair loss - When should I contact my vet?

You should contact your vet for hair loss in your pet if it is accompanied by signs of discomfort like excessive itching, licking, or scratching, or if you see other symptoms such as bald patches, redness, sores, dry/scaly skin, or changes in behaviour like lethargy or changes in appetite. While normal shedding is common, any persistent or concerning hair loss should be evaluated by a vet to rule out underlying issues.

Author

Written by Mariella Roberts, Veterinary Surgeon, Animal Trust Vets CIC | Published November 2025 | Review date November 2028 | This advice is for UK pets only and is not a replacement for seeing a vet

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