My dog's breast swells after heat, then goes down. What is it?

Question

One of my dogs breast keeps swelling after every season and she drinks lots of water .. after a couple of weeks it goes down again what could this be. Pet's info: Dog | Rhodesian Ridgeback | Female | unspayed | 11 years and 3 months old

Dr Stafford, BVetMed, MRCVS · Accepted Answer

In an older dog a swelling like this around the teat is most often a mammary lump. 50% are benign and 50% cancerous in dogs. They can be closely linked to hormones hence the fluctuation in size. Other causes would be mastitis or mammary development, but this photo does look like a lump. It can be tested by the vet to know what sort it is.

My dog's breast swells after heat, then goes down. What is it?

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