Janet Baraclough writes

I don't think pets even find them as irritating as we do; or even
notice them. I've never seen our dogs and cats scratching or rubbing
even at very engorged ticks.

It must be a personal thing. I've never had a need to scratch or rub at
even a very engorged tick - in fact, unless I'm looking for them, it's
only by accident that I find them.

Mosquitos, otoh ....!

--
Kay