Simsbury's code pulls in two directions at once, and an honest provider should tell you about both rather than only the helpful one.
The helpful one first. Chapter 65, Article I, section 65-3 prohibits the intentional feeding of wildlife, defined broadly to include feeding, giving, placing, exposing, depositing, distributing or scattering edible material or an attractant with intent to feed, attract or entice wildlife, and the code's definition of wildlife takes in wild birds. Section 65-5 authorizes a 250 dollar fine for each offense.
Two hundred and fifty dollars is the stiffest figure we have found in this service area, and feeding is the single thing most likely to hold a flock in place against everything else a property does. If somebody is reliably feeding birds on ground you control, Simsbury gives you real weight behind asking them to stop.
Now the harder one. Chapter 65, Article II governs dogs at town recreational facilities, athletic fields and trails. It defines restrained as physically controlled by leash or lead, and it prohibits both restrained and unrestrained dogs from specified team-use areas, naming the Memorial Park fields, the Curtiss Park athletic fields, the Weatogue Park athletic fields and playscape, and the Simsbury High School track, artificial turf, courts and fields. The stated exemption is for service dogs. No working-dog or commercial exemption appears in the text.
So on those named surfaces a dog is out regardless of whether it is on a lead, and those are exactly the kind of surfaces a flock will choose. Work on public ground in Simsbury therefore needs written, location-specific approval rather than an assumption, and where a named field is involved the honest answer may be that the fieldwork is not the available tool there. Habitat work and monitoring still are.
On private ground, a private club, an association, a company campus, the owner authorizes it and none of the Article II field list applies.