Careful, Pete, or you'll get your wrists slapped for going off topic!
One of the reasons we go to SuanSon (actually a few hundred metres south) is that there are very few people at that time of the morning and only one cowardly 'soi' dog. The occasional pet with owner is never a problem. We keep the leads handy in case of joggers, fishermen or children as the dogs can be a bit overenthusiastic and boisterous in their desire to spread love and affection... but they're still only 9 months old.
SuanSon also provides you with what must be 5 miles of beach from Takiap to Kao Tao, lots of space with good firm sand.
Before the dogs took over our lives, we used to go to Hat Sai Noi. It's a lovely spot, but not a dog-walking beach. Kao Tao is quite a bit closer to our place, but there are quite a few temple dogs by the beach there. Our dogs are big enough, have lovely deep barks, and the male is built like a brick outhouse, but as you say, retrievers are just big softies.
UPDATE ON THE SIDECAR
For anyone thinking of getting one of these things, here's what I've gleaned so far.
It's worked very well. The dogs love it and instead of trying to break into the car every morning, they now sit impatiently in the sidecar.
The metal floor is a bit slippery for canine paws, but that's easily resolved with an old blanket. We might put some rubber matting in at some point, but there's no hurry.
The Thais get a lot of stick on here for their approach to driving, although we know there are many countries where it's much worse. One thing I do applaud is the motorcycle lane. Yes, yes, I
know it's terribly misused

and I
really don't want yet another boring and useless discussion about driving habits and ignorant Thais, but the motorcycle lane keeps me off the main drag of Petchkasem, which is extremely handy when you can only do 40-50 kph.
One of the problems is that the m/c lane has a bit of a camber, which results in the bike wanting to pull left. Now I understand why you often see these little contraptions a bit further into the road proper than you might expect. I also understand why people wait on the left side of the road before turning right, as it's a bit of a leap of faith to sit on one of these things in the middle of the road!
The main point, though, is the size/power of the m/c. Our ageing 100cc Honda Wave is simply not powerful enough to comfortably pull what must be around 250kgs including the weight of the sidecar. It's not a question of straight-line speed, but of the engine really labouring and being unable to deal with anything approaching a serious incline.
Somebody asked about a Phantom earlier. I used to be a bit sniffy about Phantoms and the like (little bikes dressing up as big ones), but lost that bit of snobbery long ago. Might even get one myself, as I like something a tad more substantial between my legs. I'm sure you boys understand. But I wouldn't use it for a sidecar - I don't think you'd want to be doing 80 kph with one of these things attached.
Cheers all
