A neighborhood dog walker writes: "June 10, about 7am, one of the golf course employees drove by in a tractor which was pulling a spreader.  He stopped the rig and told me that he was spreading fertilizer and Merit insecticide.  According to him, dogs pads can absorb this, it lasts quite a while in the soil, but gets incorporated into the soil after the first inch of rain...."   
From Ellie Goldberg, 617 965-9637
Below are some resources for you to read about Golf Courses and the insecticide Merit.  Feel free to forward it to friends, neighbors and other dog lovers.
I believe golf courses should be required to give this information to anyone who uses golf courses, who live near golf courses, has access to golf courses (kids, dogs, etc.) , etc.  (Especially in areas with elevated cancer rates such as Newton.)
(I also think there should have been a broad public notice when the Newton Parks Department used Trimec Plus on city fields.)   
I recommend going to the GreenCAP webpages for the Pesticide Primer for basic concepts before reading the fact sheets.  http://www.greendecade.org/greenCap_primer.html
You might also enjoy this videopodcasts: The Truth about Cats, Dogs & Lawn  Chemicals http://catsdogslawnsvlog.blogspot.com/
1) GreenCAP, The Green Decade Coalition/Newton's Committee for Alternatives to Pesticides
2) JOURNAL OF PESTICIDE REFORM/ SPRING 2001 • VOL. 21, NO. 1 15 l I N S E C T I C I D E F A C T S H E E T   Imidacloprid  http://www.pesticide.org/imidacloprid.pdf
3) From Beyond Pesticides Gateway: http://www.beyondpesticides.org/gateway/index.htm  Agriculture
Toxic
See                  chart
Extoxnet,                  PAN-UK,                  NCAP,                  NPIC,                  PAN                    
4) Toxic Fairways: Risking Groundwater Contamination From  Pesticides ...The Attorney General's survey of pesticides used on Long Island golf courses .... (3) The actual rate of golf course pesticide use may be much higher than ...
5) Golf          and the Environment Beyond Pesticides'          work on golf and the environment continues to be an important strategy          for outreach to the land area with one of the most highly concentrated          per acre use of pesticides. The extensive use of pesticides on golf courses          raises serious questions about people's toxic exposure, drift over neighboring          communities, water contamination, and effects on wildlife and sensitive          ecosystems.        Beyond Pesticides          serves on a steering committee that seeks to develop a collaborative strategy          with the golf course industry in an effort to effect change. This group          developed the Environmental Principles          for Golf and the Environment. Increasingly, players and golf course          managers are asking the right questions and looking for answers that result          in meaningful reductions in pesticide use.
        In          what it calls the most important article it has ever published, Golf          Digest in its May 2008 issue (pp 196-232) published an article, "How          Green          is Golf?," which asks the hard questions about the environmental          impact of golf in a series of in-depth interviews, including a builder,          golf course superintendent, regulator, environmentalist and activist -          Beyond Pesticides executive director, Jay Feldman (read Jay's          interview).
In          what it calls the most important article it has ever published, Golf          Digest in its May 2008 issue (pp 196-232) published an article, "How          Green          is Golf?," which asks the hard questions about the environmental          impact of golf in a series of in-depth interviews, including a builder,          golf course superintendent, regulator, environmentalist and activist -          Beyond Pesticides executive director, Jay Feldman (read Jay's          interview). 
       The article spans          a range of opinions on water usage, pesticide contamination, and management          practices, with general agreement that golfer expectations and management          practices must move and are moving in an environmental direction, citing          important ways in which attitudes and understanding must change. 
       Read about this article          on Beyond Pesticides Daily News Blog, "Experts          Discuss the Greening of Golf Courses," April 17, 2008.