Use a fine-tooth comb and comb your dog's fur from the top of his leg all the way down towards his feet. Repeat this for every leg and then get ready to clip.
Decide how you want your dog's legs to look when you are done clipping. Some dogs will have longer fur and some dogs you will want to have nice and short with a neat tidy appearance. Use a blade for the approximate length you would like to keep your dog's leg hair.
Starting with the front legs will give your dog something to look at while you are clipping his fur. When he sees what you are doing, he will more likely trust that you are doing the same thing when you go to work with his back legs.
Use your clippers and start at the thigh, clipping in a straight line all the way down to the elbow. When you get to the elbow, pause and make your next line all the way down to the foot. Be careful with clippers. Do not to get too close to your dog's skin so as not to nick him. Repeat this for the front and the back of your dog's legs.
Repeat this for your dog's rear legs, only have him stand straight and stand on the side of him or behind him to reach around his rear legs. Start at the thigh and clip all the way down towards his foot.
If you would like your dog's leg hair to be longer or to be in a funnel shape, vary the length you trim it from the thigh down to the foot. Dogs who have funnel-shaped hair on their legs have shorter hair at the top and longer hair from the elbow coning out down towards the foot.
Once you are done clipping all the fur on all four of your dog's legs, use a fine-tooth comb to comb through the fur, moving in the direction it grows to make it look nice and tidy as well as remove any tangles.
Using your clippers or a pair of thinning shears, tidy up in the areas that are not straight, do not have a clean line, or need to be trimmed a bit more.
End your leg trimming session with your dog's paws.Take the shape of his paws and clip around them so you have a nice smooth edge. Then lift up each paw and trim any excess fur hanging over your dog's paw pads. If you need to trim the hair in between his paw pads or toes, you can do so with scissors or clippers.
Be sure to give your little guy a nice tasty treat at the end of any grooming session to reward him for good behavior.