there's a method by 元音老人Yuanyin i heard before, which i believe,
but it can be quite misleading and advance. sort of like instead of
letting the ant reborn back as ant again and again, isn't it better
to help them reborn in higher realm when they die etc.
there are many stories as below in the pali SUTTAs mentioning on
this.
we can learn some of this.
ANIMALS GO TO HEAVEN
The Buddha teaching is unique amongst the world religions: it is
not only for humans and gods; it is also for animals. There are
numerous stories that relate how animals who associate with good
humans or are well treated, go to heaven after they die.
The first example is that of the Bodhisattva’s HORSE Kanthaka. The
Introduction to the Jataka Commentary (which is one of the earliest
records we have of the Buddha’s early life) tells us how when the
Bodhisattva Siddhattha renounces the world, his horse Kanthaka is
so deeply saddened that he dies broken-hearted, but obviously with
a wholesome last thought-moment. He is reborn as the deva Kanthaka
in the heaven of the Thirty-three Gods (Sakra’s heaven).
The next famous animal story is found in the story of the Buddha’s
solitary retreat in the Parileyya. The Vinaya (V 1:337-357) records
how in the 10th year of the ministry, when a dispute arises amongst
the monks of Kosambi who even tell the Buddha off when he tries to
counsel them. After trying hard to reconcile them and failing, he
quietly leaves for a solitary retreat in the Parileyya forest where
he is attended by a like-minded ELEPHANT (he leaves his own tribe
for the joy of solitude). Watching how the Buddha prepares warm
water every morning the elephant Parileyyaka himself prepares it
for the Buddha. He also offers the Buddha wild fruits and takes
care of his robe and bowl.
A MONKEY, watching the elephant, offers the Buddha a honeycomb.
Later, however, in his excitement, the monkey falls on a sharp
stump, immediately dies and is reborn in the heaven of the
Thirty-three Gods. So too the elephant, who becomes the deva
Parileyyaka. This full story is given in the Dhammapada Commentary
(see “Buddhist Legends,” book 1 story 5).
Then there is the well known story of the FROG deva in the Vimana
Vatthu (Vv 852-88). It is said that once a frog sits listening to
the Buddha teaching. Although not knowing human language, it is
captivated by the Buddha’s soothing voice. As he listens entranced,
a farmer, leaning on his pole, immediately pierces him to death.
The frog is reborn in the heaven of the Thirty-three as Manduka
Deva (the frog deity). He appears before the Buddha in all his
glory to sing his praises. (The full story is given in the Vimana
Vatthu Commentary: see “The Minor Anthologies” vol 4 pages 102
f.)
One of the longest stories in world literature, that is, the Udena
cycle, found in the Dhammapada Commentary (book 2 story 1). It is
actually a cycle of nested stories spanning many lives leading to
the Buddha’s time. In one of the stories, during a plague, a poor
luckless wandering man named Kotuhalaka reaches a herdsman house
and is given some food. The herdsman feeds his DOG with the same
food. Kotuhalaka looks with envy at the dog. That night, Kotuhalaka
dies from over-eating, and his thinking about the dog leads him to
be reborn as the bitch’s puppy.
Now, a pratyeka Buddha (a solitary fully self-awakened Buddha who
does not establish his teaching) regularly comes to the house for
alms, and the dog (Kotuhalaka) takes a liking to him. When the
pratyeka-buddha finally leaves, the dog is saddened and dies. The
commentators remarks that dogs, unlike humans, are straightforward
and lack deceit. So upon dying, he is reborn in the heaven of the
Thirty-three as a deva.
One of the most famous animal stories is that of the Abhidhamma
bats. The Dhammapada story (book 14 story 2) tells us in an
interesting aside, that 500 youths, witnessing the Buddha perform
the twin wonder (a miracle of fire and water radiating from his
body), decide to go forth under Sâriputta. It is said that in
Kassapa Buddha’s time, they were BATS living in a cave where two
monks were reciting the Abhidhamma. So enthralled were they by
their sound, although not knowing its meaning, they pass away into
the heavens, and are reborn in Sâvatthî. (See “Buddhist Legends”
3:51 f)
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