If you have a very small dog, you may need to use a lower-dose liquid children's formula to get the proper dose for their weight. "Veterinarians can also prescribe the dog a form of Benadryl ...

so if you have a small dog, you will need to get the children's-strength liquid. Several other antihistamines are safe for dogs (like Claritin and Zyrtec), but Benadryl should meet your immediate ...