Parking are available in Watts Gallery (GU3 1DQ) through their opening several hours (they do shut the gates), or maybe in front of the gates if they are shut.
They has to be held on a direct when going for walks https://nelsonsdok697204.onesmablog.com/5-easy-facts-about-dog-walks-where-they-can-swim-guildford-described-68722380