Saw a bit of Moliere's Tartuffe in the park the other week. Made me go hmmmm...

"Tartuffe" = tar (weasel) + tuffie (sly.) The character is indeed a sly weasel.

I've heard tar used for ferret, martin, mink, otter, stoat and even wolverine. Similar beasties all.

The legendary Tarasque was said to have the body of a tar; or the tar is a mini Tarasque. Whichever.

A tarierre/terrier would then be a “weaseler” or “weasel dog” ie: bulldog, bird dog &c.

And just to make things intriguing, pine tar, from turpentine, originally came just from just one kind of tree, the terebinthus (pistacia terebinthus,) the turpentine tree.

The word terebinth is older than dirt, much less ye Olde French, not likely Indo-European even. The tree and the Tarasque legend both trace back to the Eastern-Med at some point but, it's sketchy.