A sampling of some of my wolves/dogs and in one case, dog-cat-creature. I have more but these are the best-looking/best-statted. All but the last are Euclid. Links to details and original finds below, where applicable:
Broken Ear - https://www.reddit.com/r/NoMansSkyTheGame/comments/nqzcbj/to_celebrate_the_new_prisms_update_here_is_a/ 'Perfect' red wolf, found by Nerozii_Gaming. Note: shouldn't actually have a broken ear. Mine is... broken.
Grim - https://www.reddit.com/r/NMSCoordinateExchange/comments/1sptr2a/sss_anomalous_cat_and_dog/ Cat & dog variant, found by --Mobius--, default green/purple.
Fenrir - has no post. AAA, solid fighter despite that. Original color is green.
Drifter - https://www.reddit.com/r/NMS_Zoology/comments/1slj1df/sss_tier_desert_wolf/ Found by Zar_Ethos. Default colors are green/brown. Again, mine's ears are broken; they should stand upright. I might have actually enlarged him, I forget!
Cerberus - https://www.reddit.com/r/NoMansSkyTheGame/comments/1sjyenb/sss_fire_dog/ my find. OG is green with a bug head, but the alternate wild gender has a dog/cat face with a broad head-shield. Mine is gene-split (the results all appear to come out like mine--back spines instead of fins, and a thin head-shield).
Loki - https://www.reddit.com/r/NMSCoordinateExchange/comments/lp14zv/guard_dogdoberman_type_fauna_wild_version_is_11m/ found by vaughanarama. Original color is dark grey+green. Mine is enlarged & recolored with Lithium. Eissentam!
NOTES!
Gender - All creatures come with two wild variants, distinguishable by appearance & randomized "gender" on the scanner. If you see a weird version, keep looking until you find the right one; reload the game if only one gender keeps spawning. I believe the Gene Splitter at the Anomaly's Egg Sequencer can also get you a third "gender"/variant, but must be overloaded.
Color - Lithium will give you medium gray with chocolate/rust brown accents. Life Support Gel (and I think Albumen Pearls, but check the various charts out there) give gray, with gray-white undersides and brown accents, perfect for the wolfy look. Cadmium gives red. Peeled Claws, Starched Fish, or Mollusc Flesh give the closest thing currently available to black (very dark shades of gray).
Personality Traits - For pet battles, Aggressive creatures can randomly use a 1-round damaging DoT, while Gentle creatures debuff the enemy's combat effectiveness or accuracy. Helpfulness procs a Combat Effectiveness or Dodge buff, while Playful pets seem broken and are using Helpful abilities last I saw. High Devotion procs a heal, while high Independence debuffs the opponent's accuracy. For a full list of items you can use to shift these one way or another, check this link: nomanssky.fandom.com/wiki/Egg_Sequencer_-_Neural_Calibrator Note that once it says Inherited, you're at max.