
I had a toy bitch whelp just over a year ago. Litter of 3, and seemed to be doing fine.
Until I noticed one very, very engorged teat, that was swollen, hard and red.
The vet told me to encourage pups to use it. My girl was making so much milk, and could have fed a couple of Rottie pups!
I then noticed that she always laid on one side, and this teat was difficult for pups to access. I kept turning her round, and holding a pup on the huge teat. Once the pups started needing more milk, the problem went away.