
It certainly is an exceptionally bad year for ticks!
I was talking to a man on the bus the other day who had been camping near Lyme Regis and couldn't believe how many there were there (aiming themselves at him!). My cat had a tick on her ear about six weeks ago, but I would think that's a hedgehog tick (we've had one in the garden) which seem to like cats but not dogs.
My lad had several ticks a few weeks ago after a trip to a nearby woodland & hill fort - unfortunately three of them were in a most indelicate place and very difficult to remove. I was snapped at merely for looking!
Are you sure your dog got the ticks from another dog? Usually ticks hang about in grass and foliage and jump on anything warm for a meal, then once fed and bloated, drop off and think about breeding. So it is most often the place you've been, not the other animals you've met, that spread them.
If they are really that bad where you are, I'd look into some kind of deterrent (neem oil is said to work, also pyrethrins which are an ingredient of cheap flea spray such as Bob Martins). Failing that, try a Scalibor collar which is effective against all kinds of biting bugs, can now be bought online without prescription. I've invested in Scalibors just in case; if the warm dry weather continues I would think the ticks will just increase this summer.
I feel it's far better to repel the ticks in the first place if you can, before they bite your dog.