This spell should be done during the waxing moon.

What you need:
1 yellow candle
candle holder
matches
Amethyst stone (fairly small)
1 Brown collar
apple, peach or lavender oil
5 silver paper clips *see note below
brown fabric paint
Needle-Nose Pliers

*(You may use jewelry-making wire but it won't be nearly as strong as
the paper clips, which are unbelievable hard to bend and shape but it is
possible)

Light the candle. Take four or the five paper clips and bend them all
out as straight as possible (use the needle-nosed pliers).

Now take the paperclips and (do what feels right to you) wrap the stone
as you would a crystal. Chant the following while doing this:

"This collar I have made by hand shall protect my pet, all evil shall be banned.

It will keep him/her in good health and always loved it is a
source of good luck that is always watching from above. No harm shall
ever come to my pet. And my will, So mote it be!"

Anoint the collar with the oil you have chosen.  Attach the wrapped
stone to the collar (like you would a license tag).

****
Author Unknown