The word Euthanasia comes from Old-Greek:
Euthanasia is thus a method to give the death by a certain and total way.
The word is used to distinguish medical puttings to death from murders.
Theoritically, thus:
On animals it is used for the following reasons:
Do not try to do it yourself, even using a method which seems correct to you.
You can't guarantee that 'all will be well done':
Let professionnals taking tidily the charge of this dirty job:
The veterinarian make an injection in a vein.
A general anesthesia may be done, but it is rare: The death is instantaneous when there is no problem (very main case).
The injection is difficult in youngs and new-borns veins because they are very thin.
It happens thus in their heart.
This is painful.
Thus, if possible, anaesthetize them before, by putting them in a waterproof box or a cardboard box containing a cloth or some cotton soaked with chloroform or ether (Warning: ether is extremely explosive).
Be kind with them, including the mother in the babies case.
Euthanasia is always a difficult act for the one who bring the animal to the veterinarian as for the veterinarian himself.
That's why we recommend the sterilisation to avoid non wanted new-borns.
For the others, by mercy, do not let anymore your Pets reaching this point:
Abandonned bitch eaten alive by Mange on Tahiti Island.