Do animals choose to die, do we too

After 30 years of working with animals at different level, from the Veterinarian point of view, scientific and absurdly precise, to the Energy worker, my question is now , if all this animals that i see going into the after Life with wisdom and serenity, have chosen their time, just because thay feel is due, or because thay miss someone loved, their courage is enligthening, and shows me the path to the transition, and explains to me in a non verbal dialogue how life and after life is one, we divide it, making the transition abrupt and painful, when is, most likely just a smooth passage into an new phase. When we inmerse ourselves into holistic, medicine, life style, etc, we enter that grey zone of intention, destiny,and random events. For us humans seems that prujudice and uproaring has contaminated intention and distoted destiny, and of course makes it difficult to differenciate a random event from a destine one that had to occur , animals surrender, and all those infinite possibilities just happen THRU them, not tTO them, and Life is a flow, and whatever occurs is acceptable. Surrender, acceptance, will bring enjoyment and happiness, and of course fullfillment. I would like to invite Cristine and Marcie, both experienced with animals and with people, spiritual and connected, with scientific savy, plus intuitive knowledge, which makes them interesting and reliable.