You need to talk with your veterinarian about this - it is possible some formulations of Benadryl could interact with your dog's thyroid medication and cause major problems.
You can give 0.5-1mg of benadryl per pound
The puppy will scratch itself more often, just as humans do when they get dandruff. They might bite or scratch at their hair until some starts to fall out, and possibly lead to a bald spot, but other than that, there isn't much else that happens when a puppy gets dandruff. I recommend getting Puppy Dandruff Shampoo to help with the dandruff problem.
Benadryl is for allergies. Don't think it'll help with the kind of poisoning chocolate can cause in dogs.
Yes. It is called dander, and most dogs are generous with it.
Dandruff does not cause any type of hair loss in people.
While Benadryl or diphenhydramine can be used safely for dogs, if proper dosage is carefully applied, diphenhydramine is not an anticonvulsant, and as such will likely not work for this application. In short, not deadly; not effective either.
Yes, a dog can overdose on Benadryl, and it doesn't take as much as you might think.
Yes, a dog can overdose on Benadryl, and it doesn't take as much as you might think.
This will depend upon the size of the dog and the exact formulation of Benadryl you are asking about.
No, this drug is for allergies.
What does your dog's Vet say?