The short answer
Area pages, and a plain line on your walking windows, so owners know before they enquire whether you fit.
Two facts decide whether an enquiry is worth either party's time: can you get to the dog, and can you get to it when the owner needs you there. Most dog walking websites answer neither.
Why "and surrounding areas" fails
It fails twice. Owners searching for a walker in their village do not find you, because the village is not on the site. And owners four miles outside the round do find you, because nothing said otherwise, so you spend your evenings replying no.
Both failures come from the same reluctance to commit to a boundary. Commit to it. A named list of places is the most useful paragraph on a walker's website.
Name the places owners name
Villages, suburbs, estates, the park everyone walks in. The words people type into a phone, not the ward names on a council map.
A coverage page lists them all. The places with real volume get their own page, with local detail: where you walk from there, parking and access, which walk types run there, and the collection window. Ten to fifteen pages is plenty. Half a postcode is a line on the coverage page, not a page of its own.
The walking window is the harder question
Owners assume they can ask for eight in the morning. They cannot, because your morning is a route and the route has an order.
So publish the windows. "Dogs are collected between eleven and two" is one sentence that prevents a large share of unsuitable enquiries, and it does not make you look inflexible. It makes you look like someone with a full round.
If the window differs by area, put it on each area page rather than trying to describe the whole schedule in one place. If you also run early morning or evening solo visits or puppy calls, say which areas those cover and how many slots there are.
Say what you cannot do
Two lines, plainly stated, save more time than anything else on the site.
You cannot usually guarantee an exact time, because traffic and dogs do not cooperate. Say the window and say that the report gives the actual time in and out.
You cannot generally fit a same-day request into a full round. Say what notice you need for an extra walk and how to ask for one.
When an area is full
Rounds fill and the page that ranks for that area is the page you should keep. Do not delete it. Change the opening line to say the round is full, give an honest wait, and offer a short waiting list form.
Owners join waiting lists for walkers far more readily than for most services, because switching walkers is a hassle they only want to do once. A leaving slot then fills in days rather than weeks.
That status should be an editable field on the page, so it takes you a minute rather than a developer.
Keep Google saying the same thing
A dog walking business is a service-area business. On your Google Business Profile that means hiding the address if you work from home and listing the areas you travel to. Those areas should match the site's coverage page, and the hours on the profile should match the walking windows on the site.
When the two disagree, owners believe Google and then ring at an hour you do not work.
Put both facts near the enquiry
The meet-and-greet booking page should repeat the coverage and the window immediately above the form, and the form's postcode field should check the area rather than accepting anything. An owner who is outside the round should be offered the waiting list instead of a booking you will have to cancel.
That single check removes the most frustrating category of enquiry entirely.
Where this sits
Area pages, walking windows, the postcode check on the booking form and the editable full or open status are all part of a dog walker website as we build it, and the same local clarity runs through our other pet business websites. What is included is on pricing. Owners are not asking you to be everywhere at any time. They are asking you to tell them where and when, before they get their hopes up.