Yes most of them do. That is one of the main reasons why dogs get spayed/neutered. In order to give birth, You need to of had your period first. So the animals that can give birth have a period. I don't know how long it is though. I am also not sure about fish, just mammals.
Answer:Pigs have the same DNA as humans
Explanation:
Answer:
learn what please answer so i can answer
Explanation:
If food coloring does have an effect on the amount fish eat, then I will test more colored fish foods.