Find out if the ketchup contained xylitol.
If it did, take your dog to the vet immediately. Even small amounts of xylitol can make your dog’s bloodstream flood with insulin, causing nausea, vomiting, and muscle weakness.
Accordingly, will a little ketchup hurt a dog?
There is no short yes or no answer as to whether dogs can eat ketchup safely. While ketchup does usually contain a couple of ingredients that can be toxic and harmful to dogs, sneaking in the occasional lick of ketchup likely won’t cause your dog too many adverse reactions.
Correspondingly, can dogs eat french fries with ketchup?
As long as it’s not literally toxic to the dog I don’t see harm in a little treat.” Animal experts, however, are unequivocal on the question of whether you can give french fries to dogs—and the answer is no.