is there any way to see what wolves/companions have what synergies? I think it would make creating good teams much easier if there was some way to see what companions have the synergies you're looking for.
If you go to your companions page (3 bar menu, below Den) and click on the "show all" filter, you can see all the companions and which synergies each companion has, as well as what kinds of attacks they have.
Finding wolf synergy really just requires either having a wolf of each breed, or going to the FM and finding a wolf of the breed you want the synergy for and then scrolling down on their page. On mobile at least, the combat information is directly below the breeding box.
I believe there are guides in the forums about which hunts can be optimized with certain companions, but many hunts cannot be 100%'d without moonstone-cost companions (most notably the icerun and darkspine enderlings)
Now, if you're trying to find which of your wolves has which companion, you'll have to do that the hard way. I usually just free up a hunting slot and then use that to see which wolves have which companions equipped at the time.