He is better than any human...
What over the counter medicine has anyone given their dog for allergies?
Our vet suggested half a Claritin for a dog of 80 lbs... she did say that it cold cause drowsiness in canines, and not to use it before the dog was a full year old. this ends up being somewhere in the neighborhood of .12-.2 mg/kg bodyweight, start at .1 mg/kg body weight and titrate up until you have the best balance between activity and symptomatic relief. dog's weight (80 lb is 80/2.2 = 36.4 kg or 3.64 mg Claritin for the dog. Claritin comes in 5 and 10mg tabs, so 1/3 to 1/2 of a 10mg tab or 1/2 to 2/3 of a 5mg tab and you should be fine. Use the same formula for Zyrtec. Unless ther is nausea involved, do not use Benadryl on dogs, it acts as a true sedative and antiemetic, just like in people.
Hope this helps.
ETA, answered this before reading the other replies.
Good news for Rocky, he doesn't have allergies.
Bad news for my boy, he's got happy tail syndrome. The walls of my house look like a murder scene so we took him in. Treatment is an ointment to help heal the wound and wrap his tail with neoprene tubing for a while to help it heal. Poor guy. He is a tail wagger and it's pretty powerful. So powerful that when we took him for boarding (for the first time) last weekend to go watch the Antares rocket launch, that he most likely banged it repeatability against the side of the kennel. We also have the cone of shame on tonight as we don't have any tubing in the house.
Good news. We had similar problems with a previous dog and it was caused by separation anxiety. He would start by chewing on his tail and then it would never heal right due to his extreme tail wagging. Do you use a crate at home while you're away?
I should add, this was never an issue until we boarded him for a weekend. He had never shown interest in biting his tail until we got him home.