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 encuclopedia of superstitions" by Christina Hole
