My bitch is now 2 weeks post whelp. Milk was slow to come in but since day 3 been absolutely fine gaining weight nicely.
Now yesterday was off. I thought calcium but turns out it was the start of mastitis teats were still soft at this point apart from very high up a small lump on teat 4.
A couple of hours after getting home (and 1st dose of antibiotics) teat 4 and 5 on the right had become hard. Hot compress, massage and fed immediately another couple of later the other side became hard did the same.
Carried on with heat massage and compress and allowed to feed all night left side is fine back to normal.
Right side much better but firm but absolutely no milk coming out??
Has she lost her mill supply now, I've had mastitis a few times but milk supply never became reduced. She seemingly only has 4 teats that are now producing. The high up ones are never used despite being 9 of them doesnt matter how hard I try. So they do not produce.
Anything I can do. The greedy pup is on the blocked teats cant thinking anything else

How do you know there's no milk coming out?  It's notoriously difficult to express dogs....

Otherwise it's pretty normal for teats that are not used to stop producing milk.

The unused teats I get totally - common sense. The back ones are very easy to Express?? They are in my breed anyway never had a problem and I could before the mastitis now 2 are working and 2 are not on the back. The ones not working is the ones with the mastitis mass in. Still never had it that milk has slowed down/ stopped like this during/after mastitis?

https://dogtime.com/dog-health/54881-mastitis-dog-symptoms-causes-treatment

Some, perhaps not all, of this article may help.  We've had this, once with our bitches but a/bs nor other treatment was not needed.   I managed to clear it using warm flannel and milking as much as I could to clear the gland.  The puppies were kept away from that teat until it was working properly again.

Keep putting the strongest pups on the teats you think are blocked or should be working.  It will either get better - in which case, great.  Or it will get worse, in which case you prob need more antibiotics.  But there's not much else you can do, besides alternating cold and hot compresses and cabbage leaves you've been keeping in the freezer...

> Keep putting the strongest pups on the teats you think are blocked or should be working.

I'd be wary of putting puppies onto a gland that's producing blood/pus (infected) but if what's coming through IS milk, fine and to be encouraged.  For me, when we had this going on (mastitis) it was only the one teat that was affected and the warm flannel treatment cleared the problem pretty fast.