This is just for fun...I'm not being serious...but let's start him off with a good beginner cycle of Test-e (which you have).

I let's say the average male who is going to start using AAS would be around 200lbs; and he would start with a dosage of 500mg/week.

500mg/200lbs = 2.5mg/lb

So...if you rat is say 2lbs, you could try 5mg/week...or maybe 10mg/week.

But hell, you may as well front-load with 15-25mg/week to start.

Give him lots of food, and a big cage/area to run in. You could even make up a controlled course (which would be challanging for him) and have a trail of food to keep him going.

WOW. Sorry...quite the rant....