Grapes and raisins are very toxic to dogs. Symptoms that dogs tend to exhibit after ingestion are; first, the dog will first vomit and then after a couple of hours there will be diarrhea, excessive thirst and also excessive urination. The toxic nature of grapes will result to acute kidney failure. The aftermath of kidney failure will be vomiting, dehydration, diarrhea, abdominal pain, and seizures.
As the effects continue, a time will come when the kidneys will completely fail. The animal will not be able to produce any urine and as a result it tends to develop a foul breathe (urine like breath). After that, it will result to elevated blood pressure and that sends it to a comma. There is no specific type of grapes that are not harmful and for that reason then you need to keep them away from dogs. Studies have not been able to determine what makes grapes harmful but it is believed that mycotoxin may be responsible for the toxic nature of grapes. Immediately you find that your dog has consumed any of the fruits make sure that you report to a vet as soon as possible. Unfortunately, there is no antidote that can help.
What happens is that the veterinarian will try as much as possible to minimize the toxin from being absorbed by the body. They can induce the dog to vomit and then administer a substance that can prevent further absorption. From there, your dog will then be administered with drugs to help flush out the toxin and also to prevent further absorption. After stabilizing, tests can be carried out so that they can determine the amount of damage that has been done to the kidneys. To avoid all this, make sure that you keep grapes and raisins away from reach of dogs.
There are however health benefits that dogs can derive from fruits. They are a good source of vitamins and some minerals that cannot be found in meat and other foods. A fruit like apple is a good source of potassium, fiber and vitamin c. however, you need to be careful not to give the dog the core or the seeds as they are toxic to them. Bananas are also good source of potassium and carbohydrates but should be given in small quantities. You can also give them blueberries as they can be a source of antioxidants, polyphenols and tannin. Most of the fruits are beneficial to dogs but we need to make sure that they are not toxic before we feed them.