Chocolate Toxicosis in Animals
For milk chocolate , approximately 62 g/kg (1 oz/lb) is potentially lethal to dogs . A chocolate toxicity calculator can determine toxicity based on an animal's weight and the amount and type of chocolate ingested.
No, chocolate is not good for dogs and should be avoided entirely. All types of chocolate—including dark, milk , semi-sweet, cocoa powder, and even white chocolate in large quantities are dangerous for dogs . Even small amounts can be toxic, and there is no safe quantity for consumption.
Two toxic components to dogs found in chocolate are caffeine and theobromine, which predominately cause stimulation of the central nervous system and heart. They also act as diuretics, which can quickly lead to dehydration.

Furthermore, visual representations like the one above help us fully grasp the concept of Can Dogs Have Milk Chocolate Biscotto.
Chocolate can be very toxic to your dog — but the amount and type of chocolate matters a lot. Here's what you need to know. This pet health content was written by a veterinarian, Dr. Debora Lichtenberg, VMD.
Can dogs safely eat biscotti, or should I be concerned if my dog just ...
Yes, biscotti can cause digestive issues in dogs , especially if they contain ingredients that dogs are sensitive to, such as dairy, certain nuts, or chocolate . Monitor for symptoms like vomiting or diarrhea and contact a vet if needed.

Chocolate contains an ingredient called theobromine (a bit like caffeine), which is toxic to dogs . Dogs aren't able to break down, or metabolise, theobromine like humans can . Theobromine mainly affects a dog's guts, heart, central nervous system and kidneys.
There shouldn't be any concerns regarding toxicity in this case, as he likely hasn't ingested enough to cause that. However, you might observe some mild gastrointestinal upset. It would be beneficial to administer half of a 10mg Pepcid every 24 hours to help protect his stomach.
Milk Chocolate - Because it contains fewer cocoa solids than darker varieties, milk chocolate has lower levels of caffeine and theobromine, but note there are no "safe" levels of these for pets.

My dog ate chocolate, what should I do (toxicity calculator)
Panicking because your dog ate chocolate ? Here's what you need to do right now—plus a toxicity calculator, symptoms to watch for, and treatment options.
Learn how much is too much, which types of chocolate are the most dangerous, and what signs to look for that may signal your dog needs treatment.