Funny you should say that. My mum's Jack Russell was sneezing like crazy the other morning, and we noticed it was worse whenever he'd been out around the plants.
I'm sure dogs must develop allergies the same as the rest of us.
Hi,
The quick answer is yes. My cocker spaniel suffers with it, so I use a little optrex diluted with a lot of water and bath his eyes in the evening and first thing in the morning, it seems to help him. I checked with my vet and he said that it was OK to do this.