Ranger Pro is sprayed at the parks where I used to take my dog (RIP Sunny), and I see kids and families playing there all the time so the use of glyphosate in these places is concerning. What peeked my concern about it was when I found there was a study that linked herbicide use generally, to the same TCC cancer my dog had (the study monitored Scottish Terriers which are most susceptible to TCC).
That study however said that there was no "significantly associated with risk of TCC" for dogs exposed to lawns or gardens treated with nonphenoxy herbicides. After reading up some more, they classified glyphosate as an amino acid type herbicide which would fit in the "nonphenoxy" category. The study had only 6% of the case dogs (dogs with TCC) that were exposed to glyphosate only, and only one control dog that was exposed to glyphosate only. With so few dogs in that study with exposure to glyphosate specifically, it seems like it neither adds or takes away. It does seem wise however to keep people and pets out of areas freshly sprayed, the problem is that there is no posted signs at parks to say when they have sprayed. I also think that it is over used in place of mowing or just being applied to places without considering the need for it.
The pics below are from last year, when I was still taking my dog to the park, and show it was applied on dirt which was pointless. Fortunately my City is receptive to taking another look at this situation and it seems things may be moving in the right direction.