Allergic Reaction.. Question for the vet.

[RaYne]

My 16 month old female Saint Bernard Lola was stung or bitten by 'something' Saturday morning around 7am. Her jowls and around her nose swelled up within 30 minutes.

I rushed her to the vet as soon as they opened at 9am. She was given a steroid shot, and an antihistamine shot. Later on that night she developed a bright red rash on ears, belly and armpits. Her skin was bright red everywhere else. She was panting and very itchy and uncomfortable. I was told not to give her any benadryl tablets until the following morning.

Since Sunday I've been giving her 50mg of benadryl 3 times a day and it is helping the itching to a degree but her her skin is still red and rashy. From what I've read she should be getting more than 50mg's for her weight. She's 115 pounds currently. Should I increase the dosage or leave it as is?

Also from what I gathered is the shots she recieved were suppose to stop the allergic reaction and the redness and rash developed afterwards. Is that normal? Or should I take her back to the vet or just relax and let the benadryl work? Just to add, my regular vet is on holidays so I saw the other vet he shares his practice with. He didn't explain anything even though I asked. Never mentioned the possibility of a a rash/hives or anything.

The pic was taken while I was waiting for the vet to open.. soon after I noticed the swelling.