Funny that this thread should come up. My Maggie (lab mix) just started
taking benadryl yesterday. The Vet first gave her an allergy shot last Thurs.
but by Friday afternoon Her itching was driving us both batty. The vet then
said to give her 1/2 the 25mg tablet twice a day. It has helped a lot.

p.s. She doesn't seem to be extra sleepy or anything, just more relaxed.