Well, i made a blinking ornament for my doggie and it fits just in its collar. It looks really good at night.
Step 1: Taking a Collar Off a Pet.
Here one had to think before taking a collar off from a dog and i say please only the owner of the pet do that job as one may get hurt doing it, and please find an alternative for the dog as it may wonder along and be lost.
Step 2: Assembling the Circuit.
Here i chose to find a 555 blinker circuit for the web http://www.satcure-focus.com/tutor/page11.htm and assembled this one in a veroboard.
Here one may say i am not using the 3v as the battery doesn't last long so i am doing by adding a 9V battery as it has longer life and this is the voltage the IC can handle normally and the IC can work with full potential.
But be sure to add a resistant on the anode of the LED as it may burn out the LED.
I have given the picture below.