I Just Spawned 2 Wolves and breeded them together and got a baby wolf.
I Accidentally pushed the baby into the water, When i came out it had the texture of the normal wolf. Then i looked at one of the adult wolfves, it had the collar, but had the normal wolf eyes.

Steps to reproduce

1. Spawn 2 wolves and tame them
2. Breed them together
3. push the baby wolf into water
4. The Baby wolf should have normal eyes for 1-5 seconds
5. The adult wolf SHOULD have normal eyes of the normal wolf

I dont know if this will work but i hope this was useful,

KLM