Many of the folks here at PetTalk have had to face the same question, Elizabeth, including me.

What I have learned is this: After it is all over, you may still have doubts. One day you'll think it was just the right thing to do. Other days, you will wonder if you did enough. At that point, talking with friends, family, and even PetTalk people will help.

For now, it is your job to give love and care. And when those cannot help any more, you'll find your answer.