A salivary mucocele (also called a sialocele) is a soft, fluid-filled swelling caused by saliva leaking from a damaged salivary gland or duct into the surrounding tissue. It most often appears as a slowly growing, painless lump under the jaw or on the upper neck.1,2 It's the most common salivary gland problem in dogs.2 Draining the fluid only helps for a while, so the usual treatment is surgery to remove the affected glands, after which mucoceles rarely come back.1,3 A mucocele in the throat can block breathing and is an emergency.1,4
Go to an emergency vet now if your dog has:
- New noisy breathing or snoring, gagging, trouble swallowing or difficulty breathing1,2
- Blue or gray gums, or fainting4
These can mean a mucocele in the throat (pharyngeal mucocele) is blocking the airway. A swelling that is suddenly hot and painful, or a dog with a fever, may have an abscess and needs a same-day visit.1,4
What the Research Says
- Surgery works well. In 140 dogs, none had a recurrence after one surgical approach, and 5 of 70 (about 7%) after the other.3
- Long-term results hold up. In 31 dogs followed for about 4 years after surgery, none had the mucocele come back.5
- Complications are usually minor. About a quarter of dogs had a problem after surgery, mostly fluid pockets (seromas), swelling or wound trouble.6,3
- Draining isn't a cure. Repeated draining may help for weeks to months, but most mucoceles come back, and each drainage risks infection.1,2
Types of Salivary Mucocele
Dogs have four pairs of salivary glands. The mandibular and sublingual glands, under the jaw, are involved most often.4,2
| Type | Where | What you may notice |
|---|---|---|
| Cervical (most common) | Under the jaw or on the upper neck, often in the middle under the chin1,4 | A soft, painless swelling that slowly gets bigger; most dogs act normal1 |
| Sublingual (ranula) | Under the tongue, on the floor of the mouth1 | Trouble eating; it may bleed if bitten, so you may see blood-tinged saliva1,2 |
| Pharyngeal | In the side wall of the throat1,4 | Noisy breathing, gagging, trouble swallowing; can block the airway1,4 |
| Zygomatic (rare) | Below or behind the eye1,2 | Swelling near the eye; the eye may bulge2 |
A swelling near the ear or cheek is less often a simple mucocele. In one study of rarer parotid gland swellings, causes included tumors and foreign bodies.7
Causes and Which Dogs Get Them
The cause is usually never found. Injury is thought to be most likely, for example from a choke collar, a bite or chewing on sticks. Inflammation, salivary stones and foreign bodies can also damage a gland or duct.1,4,2 The leaked saliva is walled off by inflammatory tissue, so it isn't a true cyst.1,4
Any dog can get a salivary mucocele. Poodles, German Shepherds, Dachshunds and Silky Terriers have been reported more often, and one large recent study found males affected more often.1,2,3 There's no typical age; in one study the average was about 5 years.1,5
How Vets Diagnose a Mucocele
- Feeling the swelling: mucoceles are usually soft and painless. Abscesses and tumors are more often firm or painful.1
- A needle sample: drawing off a little fluid shows thick, stringy saliva that is clear, yellowish or blood-tinged. Lots of white cells suggest infection.1,2,4
- Finding the side: a swelling in the middle of the neck can come from either side. Vets check under sedation where the fluid collects, and sometimes use imaging.1,4
- A mouth exam under sedation to look for a ranula or a throat mucocele.1
Other causes of a neck swelling include an abscess, a tumor, a migrating foreign body and enlarged lymph nodes.4,2 See swollen lymph nodes in dogs.
Treatment
- Surgery to remove the glands: the standard treatment removes the mandibular and sublingual glands on the affected side together. A drain is often placed for 2 to 3 days.1,2,4
- Marsupialization (opening the swelling and stitching it open into the mouth) is an option for some ranulas and throat mucoceles.1,2,4
- Draining with a needle gives only temporary relief, may need repeating and risks infection.1,2 For a throat mucocele that's blocking breathing, draining may be done first as an emergency step.4
Don't try to drain a swelling at home. There's no home treatment that makes a mucocele go away, and we found no reports of mucoceles healing on their own.1,2 Removing the glands doesn't leave your dog with a dry mouth, even if both sides are removed, because other salivary glands keep working.1,4
Recovery, Success Rate and Outlook
The outlook after surgery is excellent.1 In the largest study, 140 dogs, none had a recurrence after removal through the underside of the neck (ventral approach), and about 7% did after removal from the side (lateral approach). The ventral approach had more wound problems.3,6 A mucocele can come back if the wrong side was operated on or some gland tissue was left behind.1,4 Possible complications include seroma, infection and swelling, most of them minor.1,6 Ask your vet about pain relief and when the drain and stitches will come out.
How Much Does Mucocele Surgery Cost?
We found no published average. In one US pet insurance claim (Illinois, undated), gland removal surgery cost about $2,100.8 A consumer cost website estimates $250 to $2,500 in the US, with specialist surgeons at the higher end, but doesn't give sources.9 Prices vary by clinic and region.
Frequently Asked Questions
Can a dog live with a salivary mucocele?
A small neck mucocele is usually painless, and many dogs act normal. But it tends to grow, draining doesn't fix it and throat mucoceles can block breathing, so most vets recommend surgery.
Can a salivary mucocele go away on its own?
We found no reports of mucoceles healing on their own. Draining may shrink one for weeks to months, but most come back.
How successful is mucocele surgery in dogs?
Very successful. In the largest study, none of 70 dogs had a recurrence after the ventral approach, and about 7% did after the lateral approach.
Is salivary mucocele surgery painful?
It's done under general anesthesia, and your vet will give pain relief afterward. Most complications are minor, such as swelling or a fluid pocket under the skin.
What causes a salivary mucocele in dogs?
Usually no cause is found. Injury to the gland or duct, for example from a choke collar, a bite or chewing sticks, is thought to be most likely.
Will my dog have a dry mouth after the glands are removed?
No. Dogs have other salivary glands, so they don't get a dry mouth, even if glands on both sides are removed.
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Sources and further reading
This article was rewritten and fact-checked on October 30, 2026 against current veterinary references and specialist guidelines:
- American College of Veterinary Surgeons. Salivary Mucocele. ACVS, last modified September 20, 2024.
- Mulherin BL, DVM, DAVDC (reviewed by Carnevale J, DVM, DABVP). Salivary Disorders in Small Animals. Merck Veterinary Manual (professional version), November 2024.
- Cinti F, et al. Complications between ventral and lateral approach for mandibular and sublingual sialoadenectomy in dogs with sialocele. Veterinary Surgery 50(3):579-587, 2021.
- Seim HB. Salivary Mucocele. LAVC Latin American Veterinary Conference, Lima, 2016 (hosted by IVIS).
- Ritter MJ, von Pfeil DJF, Stanley BJ, Hauptman JG, Walshaw R. Mandibular and sublingual sialocoeles in the dog: a retrospective evaluation of 41 cases, using the ventral approach for treatment. New Zealand Veterinary Journal 54(6):333-337, 2006.
- Bellows J, DVM, DAVDC. Sialoadenectomy in Dogs with Sialocele. Clinician's Brief, January 20, 2022.
- Proot JLJ, Nelissen P, Ladlow JF, Bowlt Blacklock K, Kulendra N, de la Puerta B, Sheahan DE. Parotidectomy for the treatment of parotid sialocoele in 14 dogs. Journal of Small Animal Practice 57:79-83, 2016.
- Embrace Pet Insurance. Salivary Mucocele (customer story). Embrace Pet Insurance, undated, accessed October 2026.
- Mazzola P. How much does salivary mucocele surgery cost for dogs? Vety.com, undated, accessed October 2026.
About this article
Last updated : new page written using the American College of Veterinary Surgeons, the Merck Veterinary Manual, published surgical studies including a 2021 study of 140 dogs, Clinician's Brief and IVIS-hosted proceedings; includes the research summary, mucocele types table, diagnosis, treatment, success rate, cost, key takeaways and FAQ.
This page is for general information and is not a substitute for an exam by your veterinarian.
