What causes my pregnant goat's udder to be uneven and one side larger?
The left side does look much bigger than the right, but does not appear infected. It is not uncommon for there to be some asymmetry between the two udders, but I agree that this is rather pronounced.
Given the size of the udders, I would expect that she would be due any day now. False pregnancy is a possibility, but rather rare, so I wouldn't be too suspicious of this yet.
I would just keep an eye on the udder for any change in color or discharge like pus or blood. This would indicate that there is an infection.
If it has an infection or you are otherwise concerned, then it would be best to have a veterinarian check her out. They could have a better look at the udder, test it for signs of infection and easily be able to check for pregnancy.
I hope that helps and Iris has a kid soon.
Updated on September 23rd, 2025