Wait till you are done with the breast feeding stage then you are good to go.
...Seriously?
It should only be a matter of a couple hours.
A tattoo which is on the shin should sting for a few days.
Female dogs often get diarrhea after giving birth. This is caused by the mother dog eating the placenta, and should subside in one to two days.
giving birth
Immediately
You should not use "homemade" tattoo ink, it is not safe.
at least 2 months, the longer the better.
After 3 months
6 weeks
yes dogs do lose their hair after giving birth and it would last proably for six months.
A cow shouldn't be bleeding after giving birth. She may have a torn uterus, so you'd better get the vet out ASAP.