does this garden allow dogs?

If you become a Hillwood member dogs are allowed between 9:30 a.m. and 12 noon on Sundays only. Otherwise dogs are usually not allowed unless it is a service dog

If you become a Hillwood member, you may bring your dog and enjoy the gardens and outdoor walking paths during morning hours on Sundays only.

See above

I strongly recommend becoming a member not only can you bring your dog on Sundays but there many interesting non-canine programs and events during the year.