Putting Down Animals?

Personally, I feel that they should be put down (like I voted in the poll) under certain circumstances.
If the animal is in extreme pain, or is just old and can't function any longer, (meaning can't walk, run, etc.) then I feel they should be put down.
Just because you don't want an animal anymore, or can't find someone to adopt that animal within a specific period of time/because you ran out of room (referring to certain shelters)? NO.
No. Just... NO.

Very nicely worded my friend, Now pain, and old age yes but yeah basically exactly what you have just said -_- stole the words right from my finger tips :p