I am so sorry for what your going through :( I have had only one experience with a dog having cancer and it was a very sudden illness, then she was gone that night. I am not sure if I would rather have had it be so sudden, or been given time to say ...

Agree with illusion.

Welcome to the Min Pins! They are an awesome lil breed!
I have raised and shown them for over 20 years, and been involved in dogs and showing for 41 years!
At first look, he appears to be purebred. I would need full body pictures to say for...

I raise and show them. I have both colors, as well as a fawn/tan :)
Red are the most popular in the show ring. If it helps though, I have more reds than I do blacks, lol.

The only contraindications related to breed, is within herding breeds only.

A little confused...so she was possibly bred on Friday. You got her the shot Saturday. Another shot on Monday? Was there a second incident of her getting bred if so, what day was that? Couldnt quite get myself to understand the timing of events.

Not only is there a risk to her being so young, but also to the pups if she chooses not to nurse them...which is very common.
If she were mine, I would go ahead with the spay.

I agree. Glucosamine is good, however should also contain the Chondroitin AND MSN to get the best results.

Not sure how old the pups are, but your vet should have a shot as well that helps the dam's milk to come in. I have a homemade recipe I use when handfeeding or supplementing pups. Very likely the link that was given above has a good one as well.

A normal heat cycle will last, in general, 4 weeks from start to finish. If it has been longer and the bleeding is ongoing, I would have her checked by your vet to be on the safe side.