<human>: Can you provide a brief overview of the text?

I have a 14 year old female Shih Tzu and we go for a mile and half walk everyday in a dog friendly park. Gidget has arthritis which is well managed (She takes medication and I rehab her by walking her everyday). Recently she suffered from scratches on her corneas, she's healing up and doing great!

I'm finding that since summer has started... there has been WAY more people at the park. The park requires your dog to be on a leash at all times, however, I encounter dogs which are not on leash and try to run up to my old lady. I usually yell to the owner "she's old and blind" and the people grab their dogs. Other people just have their dogs run up to her without asking if she's friendly. I fear that she will get injured and at 14 it could turn into a major issue and could potentially become life threatening. 

Is there a easier way to address these issues? I feel bad that I have to say "she's old", but I worry that she could get knocked over and get injured.

(This also can go for kids- many people don't ask and jut pet her)

I need suggestions how to handle this. I can only walk her after work so it tends to be a peak time for the park.
<bot>: Go for walks with my little old dog and people have their dogs run up to her. How do I politely address this?