sorrow

i recently adopted a 5 year old dalmation. i had her for 2 weeks and then she bit a friend. she gave no warning, she just sneaked up and bit. i had to put her to sleep. she was the second dog that i have put to sleep. the first was dying. i felt no sorrow for the procedure, only gratitude to end her suffering. when i put the dalmation to sleep i felt a cripling sorrow. she was beautiful and so healthy.