I was just curious as to what it does to pets.

Makes them smell devine and clean.

Haha, it's a stat booster according to Subeta HQ:

Stat Booster: +1 Health,+1 Speed.

Subeta HQ has outdated info. It gives +1 Speed and +1 Defense now. You can see a full list of what boosters do here.

I was going to write about everything changing, but I didn't think stat boosters were effected. Woops! >< Thanks for correcting~!

Thanks for responding to my question Jenni and Secret. Have a nice day.