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It won't matter what tyres you use if the surface is slippy. Sand, fine gravel, moss, wet grass, wet rocks (especially limestone, slate and granite) and mud can be as tricky as ice.
Hmmmm... not so sure abut the practice of "dog joring" myself, as there's always a possibility of injuring the dog in an accident, and that wouldn't be fair unless said dog has signed consent forms and injury waivers? Seriously though, is it really fair to tie a dog to a bicycle that could run over the dog in the event of loss of control?

I wonder if your dog has a bit of cheetah in him? 60mph? Sorry to question you on that one but I'm a tad cynical on the calibration of your speedo old chap! Do you mean kmh? As a kid I owned a Dalmatian which were bred for running behind carriages/chariots/horses all day, and reputedly can maintain about 28 to 30mph for long distances, with a possible 40mph top speed short sprint. Greyhounds are faster on sprints, atround 45mph, but again nowhere near 60!

I can pedal at 28mph on my mountain bike on level tarmac quite comfortably and hit 45mph on not very steep hills. I have seen 55mph pedalling down the path off Ilkley Moor (briefly! I had to hit the brakes as there were walkers on their way up). Only possible with a decent full suspension rig as it's a rocky bumpy path, with gritty, sandy bits in places. The trick is pedal to about 30 then let gravity do the rest, but don't drag the brakes if you have rim brakes, it'll overheat them and you'll regret it by the time you need to stop quickly! Or invest in decent disc brakes, but you can still warp a disc from overheating them.