Short answer: The most common problems in Cocker Spaniels are dental disease, ear infections, eye conditions and weight gain, with a few immune and hormonal disorders close behind. In UK vet records for English Cocker Spaniels, 21% had periodontal (gum) disease diagnosed in a single year, 10% had an ear infection and nearly 10% were recorded as obese (Engdahl et al., 2023).
Cocker Spaniel health issues go well beyond the joint and mobility problems that get the most attention. This breed has a distinct set of risks across the ears, eyes, teeth and immune system that owners should know about from day one rather than discover later.
American or English Cocker: Does It Change the Risks?
In the US, “Cocker Spaniel” usually means the American Cocker. In the UK and India it usually means the English Cocker, a slightly taller and heavier dog. The two share many problems, but some risks are documented mainly in one variety, so it’s worth knowing which one you have. Where a study below covers only one, we say so.
What Health Issues Show Up Most Often in This Breed?
A 2024 VetCompass analysis of 2,510 English Cockers found higher odds than other dogs for 21 of 43 common conditions, and lower odds for 11 (Engdahl et al., 2024). Here’s how the main risks compare:
| Condition | What the evidence shows | Signs to watch for |
|---|---|---|
| Ear disease | English Cockers: 14.7× the odds of ear discharge and 1.4× the odds of otitis externa | Head shaking, smell, scratching, redness, discharge |
| Gum (periodontal) disease | English Cockers: 1.9× the odds; the most common diagnosis overall | Bad breath, tartar, red gums, dropping food |
| Dry eye (KCS) | English Cockers: 7.6× the odds; American Cockers also predisposed | Thick, sticky discharge, red or dull-looking eyes |
| Cataracts and PRA | Both varieties; PRA-prcd has a DNA test | Cloudy lens; with PRA, night blindness first |
| Glaucoma | Mainly American Cockers | Red, painful, cloudy eye, enlarged pupil (emergency) |
| Obesity | English Cockers: 1.4× the odds | Ribs hard to feel, no visible waist |
| Hypothyroidism | American Cockers 8.6×, English Cockers 2.1× the odds of crossbreeds | Weight gain, low energy, coat changes |
| Immune-mediated hemolytic anemia (IMHA) | Cockers overrepresented in several studies | Sudden weakness, pale or yellowish gums (emergency) |
Joint and back problems are covered in our dedicated guide to Cocker Spaniel joint health. Interestingly, the UK study found English Cockers had lower odds of osteoarthritis and kneecap luxation than other dogs, but seven times the odds of musculoskeletal pain.
Why Do Ear Infections Come Up So Often With This Breed Specifically?
Ear shape plays a role, but it isn’t the whole story. In a VetCompass study of 22,333 dogs, breeds with pendulous ears had 1.76 times the odds of otitis externa compared with erect-eared breeds, and Cocker Spaniels had 1.67 times the odds of crossbreds (O’Neill et al., 2021). Cockers also have a higher density of hair follicles and wax (ceruminous) glands in the ear canal. American Cockers in particular are prone to the glands thickening and overproducing, which creates a warm, waxy environment for yeast and bacteria (Kaimio et al., 2017).
This matters because ear disease in Cockers can become permanent. In the same Finnish survey, 27% of American Cockers had had otitis externa, and dogs whose first episode came before age one were more likely to reach end-stage disease. In a US referral series, 48 of 80 dogs that needed their entire ear canal surgically removed were Cocker Spaniels (Angus et al., JAVMA, 2002). Treat the first infection thoroughly and go back for the recheck, even if the ear looks better.
Allergies are a common trigger for ear infections in dogs generally, but the UK study found English Cockers had lower odds of allergic skin disease than other dogs. So if your English Cocker keeps getting ear infections, don’t assume allergies are the cause. Your vet may need to look at the ear canal itself.
Which Eye Problems Should Cocker Owners Watch For?
- Dry eye (KCS): too few tears, leading to sticky discharge and a sore, dull cornea. It’s usually managed long-term with eye medication.
- Cataracts: VCA Animal Hospitals lists the American Cocker among the breeds most susceptible to inherited cataracts.
- Progressive retinal atrophy (PRA-prcd): an inherited retinal disease that causes gradual blindness. A DNA test is available for both varieties.
- Glaucoma: in North American veterinary teaching hospitals from 1994 to 2002, 5.52% of American Cockers seen had breed-related glaucoma, the highest rate of any breed (Gelatt & MacKay, 2004). The Merck Veterinary Manual names the American Cocker first among breeds prone to sudden angle-closure glaucoma, and treats it as an emergency.
What Heart Problems Are Documented in Cocker Spaniels?
The best-documented problem is dilated cardiomyopathy (DCM) in American Cockers. In a small 1997 trial of 14 American Cockers with DCM, the dogs had low blood taurine levels, and their hearts improved with taurine and carnitine supplements under veterinary care (Kittleson et al., 1997). Don’t add supplements on your own; heart disease needs a diagnosis first.
Mitral valve disease, the most common acquired heart disease in dogs, can affect any older Cocker. However, the UK study didn’t find English Cockers more likely than other dogs to have a heart murmur. Coughing, faster breathing at rest, tiring quickly or fainting should get a prompt vet visit (see heart disease in senior dogs).
What About Immune and Hormone Disorders?
IMHA is a condition where the immune system destroys red blood cells, and it can be life-threatening. Cocker Spaniels were significantly overrepresented in a US case-control study (Miller et al., JAVMA, 2004), and later genetic work notes they’re overrepresented in several studies (Threlfall et al., 2015). Sudden weakness with pale or yellowish gums needs an emergency vet.
Hypothyroidism is more common in both varieties. A UK study found American Cockers had 8.64 times the odds of crossbreeds and English Cockers 2.10 times (O’Neill et al., 2022). Its signs (weight gain, lethargy, coat changes) are easy to mistake for normal aging, which is one reason senior bloodwork matters.
How Should Owners Approach Preventive Care for This Breed?
- Start an ear routine early. Check ears weekly and clean them as your vet advises, rather than waiting for a smell or head-shaking.
- Book eye checks. Ask your vet to look for dry eye, cataracts and glaucoma, especially in an American Cocker, and learn the emergency signs.
- Look after the teeth. Brushing and periodic professional cleanings help; see what dog teeth cleaning costs.
- Manage weight actively. Cockers are food-motivated. Use a body condition score rather than the scale alone.
- Plan for senior care. At roughly 20–34 lb, most Cockers are medium-sized dogs, which are usually considered senior at around 8–10 years (see our senior age chart by breed size). From then on, aim for twice-yearly checkups with bloodwork that includes a thyroid test.
- Insure early. Ear, eye and skin conditions that show up before coverage starts are usually excluded as pre-existing, so it pays to compare pet insurance costs by breed while your dog is young.
Cocker Spaniel health issues are manageable with proactive care. The pattern across ears, eyes, teeth and hormones is well documented, so most problems can be caught early rather than coming as a surprise.
This article is for informational purposes only and does not replace guidance from your veterinarian.
Sources
- Engdahl KS, Brodbelt DC, Cameron C, Church DB, Hedhammar Å, O’Neill DG — Demography and disorders of English Cocker Spaniels under primary veterinary care in the UK, Canine Medicine and Genetics, May 2023
- Engdahl KS, Brodbelt DC, Cameron C, Church DB, O’Neill DG — English Cocker Spaniels under primary veterinary care in the UK: disorder predispositions and protections, Canine Medicine and Genetics, January 2024
- O’Neill DG, Volk AV, Soares T, Church DB, Brodbelt DC, Pegram C — Frequency and predisposing factors for canine otitis externa in the UK, Canine Medicine and Genetics, September 2021
- Kaimio M, Saijonmaa-Koulumies L, Laitinen-Vapaavuori O — Survey of otitis externa in American Cocker Spaniels in Finland, Acta Veterinaria Scandinavica, 2017
- Gelatt KN, MacKay EO — Prevalence of the breed-related glaucomas in pure-bred dogs in North America, Veterinary Ophthalmology, 2004
- Merck Veterinary Manual — Acute Glaucoma in Small Animals, July 2024
- VCA Animal Hospitals — Cataracts in Dogs
- Kittleson MD, Keene B, Pion PD, Loyer CG — Results of the multicenter spaniel trial (MUST): taurine- and carnitine-responsive dilated cardiomyopathy in American cocker spaniels, Journal of Veterinary Internal Medicine, 1997
- Threlfall AJ et al. — Analysis of DLA-DQB1 and polymorphisms in CTLA4 in Cocker spaniels affected with immune-mediated haemolytic anaemia, Canine Genetics and Epidemiology, 2015
- O’Neill DG et al. — Frequency, breed predispositions and other demographic risk factors for diagnosis of hypothyroidism in dogs under primary veterinary care in the UK, Canine Medicine and Genetics, 2022
