http://www.buddhistdoor.com/OldWeb/reso ... otus25.htm"If they must be saved by someone in the body of a heavenly dragon, yaksha, gandharva, asura, garuda, kinnara, mahoraga, human, or nonhuman, and so forth, he will manifest in such a body and speak Dharma for them.
"If they must be saved by someone in the body of a Vajra-wielding spirit, he will manifest in the body of a Vajra-wielding spirit and speak Dharma for them.
"Inexhaustible Intention! Guanshiyin Bodhisattva has accomplished merit and virtue such as this and, in all manner of forms, roams throughout the land, saving and liberating living beings.
Of course you can always tranfer the merit of chanting sutras, nenbutsu for t birth in the Pure Land. My deceased pet dogs have buddhist names and I chanted the small Amida sutra for their rebirth.
https://www.nippon.com/en/in-depth/d004 ... -pets.html