[MomOfTwoBoJacks]

Hello All,
I have two four month old Jack Russell Boston Terrier cross puppies (they are from the same litter). When we got them they were 9 weeks old and eating Acana. Within two weeks of coming home the vet changed their food due to too much protein which was giving them diarrhea. She switched them to Royal Canin Development Puppy. They also had their second vaccination on that visit to the vet. About a 1 1/2 weeks later we noticed one of the puppies had a red patchy area near the groin. We thought it was a urine burn or that he had scratched it on something while outside, we figured it would just heal and go away. Another 1 1/2 weeks went by and they were back to the vet for their third vaccination, they have still been on the same food this whole time. The one puppy still had the red area. A couple days later his red area now had moved into his inner hind legs, so now he had it in three spots. I phoned the vet and she said to put some polysporin on it and it should go away. Jump ahead 2 weeks now both dogs had the same thing, their inner hind legs were both really red and looked really sore, they had the red spot near their groin, plus their whole under carriage had a pink tone, also their feet had a pink tone. They were scratching a lot and biting at some of the areas. We went to the vet and she figured it was allergies, but we had to figure out from what. She put them on an antibiotic and antihistamine. We went home and I washed and double rinsed all their bedding (thinking maybe it was from soap), we also kept them inside all week (except for pee brakes) thinking that maybe it was the garden or the grass. Four days later we noticed the really red spot were getting better. By the end of the antibiotics the red was gone, but the pink undertone never really went away. We kept them off the grass another week to give it longer to get better. I should mention that the red sore spots were not as red, but the skin was kinda bumpy like elephant skin. Also, just before they started antibiotics we switched their food to Blue Buffalo Puppy Small Breed Chicken and Oatmeal. So jump ahead two weeks and everything looked way better except for a bit of the pink undertone. So we decided they could have a day outside. I should mention that we ran out of the small bag of food and we again switched to Blue Buffalo Puppy Chicken and Brown Rice. One day later they had those red sore spots again in all the same areas. Was it the grass or was it the food. Or is there an underlying reason why this is not going away and by going outside did it just re-irritate the areas. Could it be yeast, or fleas (though we have not seen signs of fleas), or some other skin infection. Is it a food allergy, or environment allergy. We just don't know, we just don't understand why it is not going away. At this point any advice would be greatly appreciated. Anyone have a similar situation?