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No, he is old all old dogs do that.
Green discharge is a sign of infection. Go see your veterinarian.
After giving birth, dogs secrete a discharge which can be of dark green to black color. This discharge can last for 18-21 days. In the beginning, this discharge is frequently seen but reduced in quantity as time passes. This discharge is part of cleaning process of uterus. If the discharge is accompanied by a foul smell, you should not delay in having your dog examined by your vet. That said, it's always wise to have your vet examine a dog within two days of having a litter.
yes
Simple, you smash it up and hide some bacon grease in it. they will love it :)
Right after the female stops bleeding is when she can be bred. She will get a clear with pinkish discharge after bleeding, which is when you can breed her, but she will not accept a male while still bleeding.
Yes, well there was with my dogs, have fun with the puppies! Oh and if there is anything you are concerned about you should call your Vet, the internet isn't normally reliable.
The dog should not be in pain due to being in heat.
yes they do and you have to keep mopping it up an every time they sit then move there is a patch of red discharge
Probably not. While the dog may leave it for later, it's best to wash it out. it can go stale, and can upset the dogs stomach.
Reservoir Dogs
I think you should be less concerned about rug burn and more concerned about the possibility or your dogs having worms. He could also need his anal glands emptying (ask your vet). All dogs scoot occasionally but if he is doing it enough for you to worry about rug burns please check his health.