I rarely go to dog parks anymore because of things written on here and other reasons,,,Giardia, irresponsible pet owners in many respects.
If I go it is early in the morning when no one is there. Then a few people come, Capo runs with their Dogs then I go. I also go when it is VERY COLD and lots of snow. Naturally, My Pooch LOVES the snow.
Capo also got bit[ a ball was thrown and he got it,he is fast!] by a 130 pound Rottweiler ,that was it for me for at least another year!
I think the trainers advice is good!! Stay away from the place!
p.s. Running free for a Dog is the best exercise but certainly has it's risks in a Dog Park! I walk Capo 6 miles a day for maintenance!