I'm having the same problem with my 1 year old french bulldog. She is constantly getting rashes. I've taken her to the vet for them, which she did recommend wiping her paws when she comes inside. I've been doing that and giving her zyrtec (also recommended by the vet) and she still gets rashes. Mainly on her chest so I'm assuming it's coming from the grass.
I may try the benedryl cream and see if that works. The vet did give me a topical spray but it doesn't seem to make a huge difference. Any other advice would be great!