Calf

To stroke a calf on the back - bad luck to both the person and the animal

Twin calves - bad luck

Giving mistletoe as a gift to the first calf of the year - good luck to the herd

Cat

A kitten born in May - a witches cat

A black cat crossing your path - good luck (A white cat in USA, Spain and Belgium)

A black cat seen from behind - a bad omen

Stray tortoishell cat - bad omen

Cats bought with money will never be good mousers

Cat sneezing once - rain

Cat sneezing three times - the family will catch a cold

USA belief - A cat washing on the dorstep - the clergy will visit

Killing a cat - sacrificing your soul to the Devil

Kicking a cat - Rheumatism

Cockerel

White cockerel - good luck

Black cockerel - evil spirits

A cockerel standing in a doorway - a visitor

It is believed that the cockerels will all crow on final day to awaken the dead

Cow

A cow lowing after midnight - approaching death

To milk a cow being sent to market - bad luck

Sprinkling the cowshed floor with primroses - a guard against witches

Cows lying down in a field - rain

Crow

A messenger of the gods

A familiar of the traditional witch

Harbingers of death and disaster

Cuckoo

First sound of a cuckoo in spring coming from the right - good luck

First sound of a cuckoo in spring coming from the left - bad luck

Hearing the first cuckoo on the 28th of April - Excellent luck

Hearing the first cuckoo on the 6th of April or after midsummer - bad luck

Your condition on hearing the first cuckoo will remain all year

Dog

Meeting a dog - good luck (especially dalmations)

A greyhound with a white spot on it's forehead - good fortune

Being followed by a strange dog - bad luck (especially black dogs)

A dog eating grass - rain

The spectral black dog (barghest) - a harbinger of death

A dog howling for no reason - unseen spirits

A dog howling three times - A death has occurred

At one time a dog who had bitten someone was immediately destroyed to protect the person from rabies (even if the dog was healthy)

Dolphin

Dolphins are believed to transport the souls of the dead to the afterlife

Dolphins playing in fine weather or close to the shore - Wind

Donkey

Placing three hairs from a donkey's shoulders in a muslin bag worn around the neck - cure for whooping cough or measels

Sitting backwards on a donkey - cure for snakebites and toothache

A pregnant woman seeing a donkey - the child will grow wise and well behaved

Dove

Miners seeing a dove - bad omen

A dove circling above - an omen of death

Killing a dove - misfortune

Dragonfly

Catching a dragonfly - marriage within the year

Duck

Laying dark brown eggs - bad omen

Flapping it's wings while swimming - rain

information sources:

"Dictionary of superstitions" by David Pickering

"The encyclopedia of superstitions" by Christina Hole