Wolf texture change

Hi, I'm a beginner in datapacks. I just need the normal wolf (the wolf without variations) to have a red collar without being tamed. It seems like this could be done with a texture pack, but I already tried, and for some reason, it doesn't work if you replace the wolf_tame.png texture with wolf.png. I also tried with the other variations, but it still doesn't work. I don't know if this is possible with datapacks. I would be very grateful if you could help me