I can't claim to avoid attachment, maybe I try to avoid clinging since all things are impermanent. I am still in a dualistic mindset, clearly! If another sentient being such as a pet is in distress which cannot be removed or ameliorated, allowing a vet to end that suffering can be the greatest act of compassion possible. I have been in that position, the right choice is based on love, not on a selfish desire. Buddhism is said to fly with two wings - compassion and wisdom.I'd like to hear how Buddhism handles pets. Do you avoid attachment from the beginning? What if the pet has to be 'put down'? Isn't it against Buddhism to end the life of a living thing? What if your pet is suffering?