Should animal Euthanasia be legal

In my opinion, it should be legal in the same way as I feel it should be legal for humans.

Which means it is humane to allow a human being or animal to die under the following circumstances;

they are dieing (for certain) from a condition that brings them pain or suffering to a degree they cannot tolerate, and (in humans) express the desire to end the pain through death.If someone chooses death over life in this circumstance it is clearly logical that the pain and the road in which death is anyway inevitable should never,ever be questioned,or should any law,or person be permitted to decide if someone has had enough.This is not freedom,nor is it empathy..It is a hard headed opinion from a person who has no experience whatsoever in the illness this person is living with.It would be like hiring a truck driver to perform brain surgery on you.These opinions are laughable.

As far as animals the decision to euthanise should be one of empathy and logic.

If the animal is obviously suffering and dieing,give me one reason why they should suffer a moment longer than they have to?

Animals captured,and living in animal shelters should only be euthanised under the same exact circumstances as I listed above.

Killing an animal simply because it may be old,not considered adoptable for any reason but otherwise in fair to good health.NOT DIEING.Should under no circumstances be killed.