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Experienced and professional animal trainer provide their insights in answering this question :
A. If it was milk or white chocolate then your dog will be fine. If it was dark chocolate or chocolate with a lot of cocoa powder then there is small risk that she may still show symptoms like restlessness, agitation, racing heart. However, if it happened 8 hrs ago and she is fine at the moment then it is unlikely that she will show any more symptoms than vomiting and diarrhea.

How to Identify Common Pet Problems ?

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Threat to pets

For milk chocolate, any ingestion of more than 0.5 ounces per pound of body weight may put dogs at risk for chocolate poisoning. Ingestions of more than 0.13 ounces per pound of dark or semi-sweet chocolate may cause poisoning.

In simpler terms, that means a very concerning dose of chocolate is approximately one ounce of milk chocolate per pound of body weight. Since an average Hershey`s Milk Chocolate bar is 1.55 ounces, consuming even one chocolate bar can have serious consequences, especially for small dogs.
Dark Chocolate: Use a scale of 1.5 ounces per 10 pounds of body weight. That`s 3 ounces for a 20 pound dog. If they`ve ingested that much or more, it`s time to call your vet. Milk Chocolate or Semi-sweet: A poisonous amount would be anything over 3.5 ounces- a standard size Hershey`s bar- for a small 10 pound dog.
It can take 6 to 12 hours for symptoms of chocolate poisoning to appear in your dog. So, if you already know your dog`s eaten chocolate, don`t wait for any of the above symptoms to appear, call your vet. If it`s after hours and your veterinarian`s clinic is, call a local emergency vet.
To put this in perspective, a medium-sized dog weighing 50 pounds would only need to eat 1 ounce of baker`s chocolate, or 9 ounces of milk chocolate, to potentially show signs of poisoning. For many dogs, ingesting small amounts of milk chocolate is not harmful.
In general, mild signs (vomiting, diarrhea, polydipsia) may be seen in dogs ingesting 20 mg/kg, cardiotoxic effects may be seen at 40–50 mg/kg, and seizures may occur at dosages ≥60 mg/kg. One ounce of milk chocolate per pound of body weight is a potentially lethal dose in dogs.”
The toxic dose for theobromine is reported as 100-150mg per kg body weight, however occasionally problems are observed at doses as low as 20mg/kg. What this means in a practical sense, using 100mg/kg as a guide this equates to: approximately 60 grams of milk chocolate per kg bodyweight.
How is chocolate poisoning in dogs treated? Treatment for chocolate poisoning in dogs may include induced vomiting, activated charcoal, intravenous fluids, heart medications, anti-convulsants, and antacids, depending on the clinical signs.
What happens if a dog eats chocolate? Chocolate contains properties that are toxic to dogs. Depending on the dog`s size and how much chocolate it ingests, a dog can experience poisoning with symptoms that range from vomiting and diarrhea to seizures and sudden death.
The sugar levels in chocolate can cause an upset stomach and diarrhea in your dog as well. One piece of chocolate should not harm your dog, but multiple pieces can harm your dog.
ANSWER: Chocolate measures as follows: 1 square of chocolate is equal to 1 ounce.
Affected dogs show signs 30 minutes to 4 hours after ingesting the poison. Initially affected dogs become anxious and have an elevated body temperature. Panting is usually seen. Progressively they become worse and staggery.
Dogs can`t metabolize theobromine in the same way as humans, making them highly susceptible to the chemical. In some cases, consuming 1 to 2 ounces of chocolate can kill dogs, while other kinds of chocolate only take 0.3 ounces to become deadly.
Milk chocolate: Approximately 3.5 ounces (more than 2 regular Hershey`s Milk Chocolate Bars) for a 10-pound dog, 7 ounces for a 20-pound dog, and 10.5 ounces for a 30-pound dog all require a call to the vet.
Chocolate poisoning is very serious.

Theobromine is a long lasting, very potent toxin that can cause death. This toxicity is largely unfamiliar to most people, who may not worry too much if their dog vomits after eating a large quantity of chocolate.

A 35 lb dog could safely consume 3.5 oz of milk chocolate. That`s a couple of packages of regular sized M&M`s. If your dog ate an entire bar of dark chocolate (3 oz), he would experience vomiting and diarrhea. Once again, taking him to the vet right away may make his life a lot easier.
If your dog eats chocolate, the first thing you need to do is contact your veterinarian. They will likely tell you to make the dog vomit to get the chocolate out of his digestive system. You can use 3% hydrogen peroxide to induce vomiting in dogs.
For dogs, raw and whole meals are good options. Organic meals, natural vegetarian sources, and even biodynamic foods are perfect! Foods like beetroots, carrots and even shredded coconut would work towards detoxifying your dog`s gut! This food can clean out your dog`s digestive system and prevent indigestion.
So, what does this mean for your dog who ate a chocolate bar? It means they will feel nauseous and probably vomit, they`ll have a high heart rate, diarrhea, show signs of hyperactivity and, if they consumed a high dose of methylxanthines, tremors, seizures and possibly death.
Approximately 150g of dark chocolate is toxic to a 10kg dog.
Recovery can be complete and prognosis good if caught and treated early (within 2 hours of ingestion). Chocolate poisoning can be lethal at high doses. Always keep chocolate out of reach of your pet.
As a rule, try fasting your dog for 24 hours when they start vomiting—offer water, but no food. If they continue to vomit during that period of time, they need to have a veterinary exam. If the dog doesn`t vomit in those 24 hours, but then begins to vomit again after the 24-hour fast, they need to see a veterinarian.
It takes approximately 54 chocolate chips to make one full ounce. However, various chocolate chip manufacturers use different molds for their chocolate chips, so the amount required to make a full ounce may vary slightly.
Any amount of chocolate is too much for your cat. All forms of chocolate are hazardous to your furry friend, such as dry cocoa powder and baking chocolate (most toxic due to their high level of theobromine), dark, semi-sweet, and milk chocolate, and even white chocolate, with its low percentage of cocoa.

Relevant Questions and Answers :

the most relevant questions and answers related to your specific issue

Q. My 42 pound Beagle ate about an ounce or 2 of chocolate about 8 hours ago. She vomited, and most came up. My husband is still very concerned.
ANSWER : A. If it was milk or white chocolate then your dog will be fine. If it was dark chocolate or chocolate with a lot of cocoa powder then there is small risk that she may still show symptoms like restlessness, agitation, racing heart. However, if it happened 8 hrs ago and she is fine at the moment then it is unlikely that she will show any more symptoms than vomiting and diarrhea.

Q. Which common foods are poisonous to pets?
ANSWER : A. That’s a great question. As responsible pet owners we need to be aware of food items that can be harmful to our canine or feline companions. Here are some of the most common foods proven to cause illness in our animals at home:

Chocolate: A favorite and irresistible treat amongst most humans, chocolate is considered toxic to dogs. In very small amounts it is usually not a huge issue, but with larger volumes and with darker chocolates pet owners should be concerned. Chocolate contains methylxanthine theobromine, which is similar to caffeine. Chocolate ingestion can cause vomiting, diarrhea, hyperactivity, issues with normal heartbeats, seizures, and in some severe cases, death. It is best to keep your favorite chocolate treats in a good hiding spot and out of reach of your dog or cat.

Grapes and raisins: Dogs should not consume grapes and raisins because of the risk of acute kidney failure. Most dogs experiencing grape or raisin toxicity will begin to have vomiting and/or diarrhea within 6-12 hours of ingestion. Other abnormal clinical signs include lethargy, abdominal pain, dehydration, and tremors. Kidney failure develops within 24-72 hours of the initial ingestion. There are some dogs that do not experience these devastating side effects. It is best to contact your veterinarian or veterinary emergency facility if you believe your pet has ingested grapes or raisins.

Garlic and onions: We often forget that our meals contain these two popular ingredients and will allow our furry companions a few bites or licks. Onion and garlic both can cause a type of poisoning that results in damage to red blood cells, making them more likely to rupture. They can also cause stomach upset and mouth irritation. Look for pale gums, increased breathing or drooling or any vomiting or diarrhea.

Bread dough: Unbaked bread dough is considered poisonous to our pets. The bread dough, when ingested, expands in the stomach because of the warm and moist environment. This can lead to a bloated or even twisted stomach. In addition yeast is often added to our baking products to help get bread to rise, and when this yeast is fermented it produces both carbon dioxide and alcohol. The alcohol produced can be absorbed into the bloodstream and causes dangerous drops in blood sugar, blood pressure and body temperature. Common clinical signs include vomiting or retching, distension of the stomach, weakness and collapse.

Macadamia nuts: Ingestion of these nuts are not proven to be fatal in dogs but can cause them to experience uncomfortable clinical sings, including fever, joint stiffness, vomiting, tremors and difficulty walking, especially in their hind legs. Often your pet will start to feel better after about 48 hours, but supportive veterinary care (such as pain medication) may help ease their discomfort.

Xylitol: The most common ingredient used in sugar-free gum is xylitol, which is a non-caloric sweetener. It is also found in some oral rinses, toothpastes and vitamins. Xylitol and dogs do not mix – it can cause a dangerous drop in blood sugars levels. Dogs will often display signs of disorientation, black tarry stool, tremors and seizures. If severe enough some dogs have developed liver failure. Keep your gum away from your canine companion.

Avocados: Avocados are not actually poisonous to dogs or cats but as many veterinarians can tell you the avocado pits can cause a foreign body obstruction. Avocados contain persin, which is actually toxic to the majority of pet birds. The abnormal clinical signs associated with avocado ingestion in birds include, respiratory distress, inability to perch, liver and kidney failure and sudden death.

Go forth and enjoy your favorite foods, but keep in mind which foods you should avoid sharing with your furry family members. Whenever in doubt, contact your veterinarian for healthy and safe food suggestions.

Q. Chocolate – one regular chocolate bar and two large gooie gooess. Should I make her vomit? Small 30 lb female sheltie. 14 yrs old.
ANSWER : A. Since it has been well over two hours at this point, vomiting won’t accomplish anything useful. The effects of chocolate on a pet depends on a few factors: how big the pet is, how much they ate, and how dark the chocolate is. The darker the chocolate, the higher the concentration of theobromine, the ingredient that pets are sensitive to.

Your pet should be seen by your veterinarian right away. Chocolate is a toxin that will affect your pet’s nervous system and can cause seizures and death. It depends on the size of your pet and the amount and concentration of chocolate he consumed. Make sure to take the package with you so you can let your veterinarian know what they’re dealing with. They will do an exam, bloodwork and possibly an ECG to see if the heart is having any arrhythmias.

Q. My dog ate about 8 grapes (he is a 47 pound shetland sheepdog) is that ok?
ANSWER : A. The amount of grapes that can hurt a dog can vary by the dog’s weight. Toxic doses begin at about 0.18 ounces of grapes per pound of dog weight however, they can affect dogs differently. Any amount of grapes should be considered toxic. Seek veterinary attention immediately. If the ingestion was within two hours, vomiting is usually induced and activated charcoal administered. Intravenous fluids may be given for 48 hours. Blood chemistry panels are checked for 72 hours. Monitor for vomiting, diarrhea, lethargy, loss of appetite, difficulty breathing, tremors or hyperactivity.

Q. Is chocolate bad for my dog?
ANSWER : A. Yes chocolate is toxic to dogs. The higher the cocoa content the more toxic it is. Therefore, less amount of 80% dark chocolate needs to be consumed compared to white chocolate before toxic signs can be appreciated.

Also, the weight of the dog is important in terms of the amounts needed to be ingested before toxic symptoms appear. Less than 1oz of milk chocolate per 1lb of bodyweight needs to be eaten to be potentially lethal and less than 0.1oz per 1lb of baking chocolate is needed to be potentially fatal. If you are unsure, you should always contact your vet or emergency vet straight after ingestion.

If your dog has eaten more than the toxic amount, vomiting needs to be induced within two hours of ingestion. Clinical signs usually occur within 6-12 hours post ingestion. Mild signs can include increased thirst, restlessness, vomiting and diarrhea. More severe signs can include hyperactivity, increased urination, muscle tremors, unbalanced/uncoordinated, seizures, increased heart rate, increased breathing, coma and death.

Q. My dog or dogs ate some chocolate while I was gone. Not sure if both ate or just one. I’m guessing about 4 oz. of milk chocolate were digested. Help!
ANSWER : A. It would be helpful to know the weight of your dogs. Milk chocolate is much less toxic than darker types and 4oz among more than one terrier would be expected to have mild-moderate side effects. If it was within the last hour it may be helpful to arrange to have the dogs to vomit any which may be still in their stomachs but if it has been greater than 3-4hours this will not help. Monitor closely for any signs of tremors, agitation or confusion which would require urgent treatment, some mild vomiting or diarrhea would be expected.

Q. My dog ate 2 candy bars, a Snickers and M&Ms. Is this toxic? He is a 13.4 lbs Chorckie. He drank water and ate some carrots too
ANSWER : A. Chocolate is toxic to dogs. Dark chocolate is usually more harmful than milk chocolate products, as the cocoa content (which is the toxic part) is higher, however any chocolate product if eaten in a high enough amount can be harmful.

It is best to contact your local veterinarian or emergency clinic for care if your dog has ingested chocolate. If the ingestion was recent, your vet may recommend inducing vomiting and can give you instructions unique to your dog for care. If the ingestion was not recent, your vet may recommend bringing your dog in for care, or monitoring for signs of toxicity such as vomiting, diarrhea, lethargy, abdominal pain or changes in behavior or appetite.

Q. Dog threw up. Yesterday and not pooping today. Ate very little but. Still drinking.
ANSWER : A. If your dog threw up yesterday and hasn’t eaten normally today I’d say that’s about 24 hours of GI distress, which is starting to get concerning. You can try feeding a bland diet – boiled white meat chicken and boiled white rice mixed 25% chicken:75% rice – in small (1/2 cup) frequent (every 2 – 4 hours) feedings. If no more vomiting, attitude is improving and he seems to be feeling well, transition to normal diet in 12 hours. Otherwise – no appetite, vomiting continues – take him for an exam. He could have an intestinal blockage. I’d watch him very carefully.