"randy" wrote in message
oups.com...
We do have a dog that had one tick but we removed it and searched for
others and we did'nt find any more. This looks like an egg because
it's round - like you could roll it across the floor. They are a half
inch in diameter - could this really be a tick? and could the vet
figure it out from the squashed ones if we bring them in?

A fully engorged dog tick can get about that big, yes. IME, they are roughly
the size and shape of a purplish grey kernel of corn. Once they get to that
point, they drop off. Is your dog long-haired?

Here's a lovely shot of an engorged tick, about 1 cm long:
http://bugguide.net/node/view/14795