
HIGH LONESOME RANCH, INC
Birch River, West Virginia 26610
Jim & Marcy Lilly hlrinc@yahoo.com
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Human Foods that Poison Pets
Chocolate
Onion and garlic
Macadamia Nuts
Other
foods
Chocolate toxicity
Chocolate contains theobromine, a compound that is a cardiac stimulant and a
diuretic.
When affected by an overdose of chocolate, a dog can become excited and
hyperactive. Due to the diuretic effect, it may pass large volumes of urine and
it will be unusually thirsty. Vomiting and diarrhoea are also common. The effect
of theobromine on the heart is the most dangerous effect. Theobromine will
either increase the dog’s heart rate or may cause the heart to beat irregularly.
Death is quite possible, especially with exercise.
After their pet has eaten a large quantity of chocolate, many pet owners assume
their pet is unaffected. However, the signs of sickness may not be seen for
several hours, with death following within twenty-four hours.
Cocoa powder and cooking chocolate are the most toxic forms. A 10-kilogram dog
can be seriously affected if it eats a quarter of a 250gm packet of cocoa powder
or half of a 250gm block of cooking chocolate. These forms of chocolate contain
ten times more theobromine than milk chocolate. Thus, a chocolate mud cake could
be a real health risk for a small dog. Even licking a substantial part of the
chocolate icing from a cake can make a dog unwell.
Semi-sweet chocolate and dark chocolate are the next most dangerous forms, with
milk chocolate being the least dangerous. A dog needs to eat more than a 250gm
block of milk chocolate to be affected. Obviously, the smaller the dog, the less
it needs to eat.
Onion and
garlic poisoning
Onions and garlic are other dangerous food ingredients that cause sickness in
dogs, cats and also livestock. Onions and garlic contain the toxic ingredient
thiosulphate. Onions are more of a danger.
Pets affected by onion toxicity will develop haemolytic anaemia, where the pet’s
red blood cells burst while circulating in its body.
At first, pets affected by onion poisoning show gastroenteritis with vomiting
and diarrhoea. They will show no interest in food and will be dull and weak. The
red pigment from the burst blood cells appears in an affected animal’s urine and
it becomes breathless. The breathlessness occurs because the red blood cells
that carry oxygen through the body are reduced in number.
The poisoning occurs a few days after the pet has eaten the onion. All forms of
onion can be a problem including dehydrated onions, raw onions, cooked onions
and table scraps containing cooked onions and/or garlic. Left over pizza,
Chinese dishes and commercial baby food containing onion, sometimes fed as a
supplement to young pets, can cause illness.
Onion poisoning can occur with a single ingestion of large quantities or with
repeated meals containing small amounts of onion. A single meal of 600 to 800
grams of raw onion can be dangerous whereas a ten-kilogram dog, fed 150 grams of
onion for several days, is also likely to develop anaemia. The condition
improves once the dog is prevented from eating any further onion
While garlic also contains the toxic ingredient thiosulphate, it seems that
garlic is less toxic and large amounts would need to be eaten to cause illness.
Macadamia Nuts
Macadamia nuts are another concern. A recent paper written by Dr. Ross McKenzie,
a Veterinary Pathologist with the Department of Primary Industries, points to
the danger of raw and roasted macadamia nuts for pets.
The toxic compound is unknown but the affect of macadamia nuts is to cause
locomotory difficulties. Dogs develop a tremor of the skeletal muscles, and
weakness or paralysis of the hindquarters. Affected dogs are often unable to
rise and are distressed, usually panting. Some affected dogs have swollen limbs
and show pain when the limbs are manipulated.
Dogs have been affected by eating as few as six macadamia kernels (nuts without
the shell) while others had eaten approximately forty kernels. Some dogs had
also been given macadamia butter.
Luckily, the muscle weakness, while painful, seems to be of short duration and
all dogs recovered from the toxicity. All dogs were taken to their veterinary
surgeon.
Pets owners should not assume that human food is always safe for pets. When it
comes to chocolate, onions, garlic and macadamia nuts, such foods should be
given in only small quantities, or not at all. Be sure that your pets can’t get
into your stash of chocolates, that food scraps are disposed of carefully to
prevent onion and garlic toxicity and that your dog is prevented from picking up
macadamia nuts if you have a tree in your garden.
Other potential dangers
Pear pips, the kernels of plums, peaches and apricots, apple core pips (contain
cyanogenic glycosides resulting in cyanide posioning)
Potato peelings and green looking potatoes
Rhubarb leaves
Mouldy/spoiled foods
Alcohol
Yeast dough
Coffee grounds, beans & tea (caffeine)
Hops (used in home brewing)
Tomato leaves & stems (green parts)
Broccoli (in large amounts)
Raisins and grapes
Cigarettes, tobacco, cigars
taken from:
http://www.petalia.com.au