We have a 120 lb. Chespeake Bay Retriever who is now suffering from torn ACL's, hip dysplasia and front leg problems.  Since he now has a constant need to go to the vet for x-rays and treatment, we thought it would be useful and helpful for us to use one of the pet ramps we sell. Depending on the car you have, there are pet steps out there for every car.  We have an SUV and opted for the Ultralite Ramp by Solvit (one of the products we sell in our store). 

The ramp is light enough to use and easily sits on the top part of my trailblazer for ease of use.  When first purchasing any steps or a ramp, please understand that most dogs will not naturally take to them, and it does take some time and training to get the animals to use the gear.  The first step would be to ensure the product you are purchasing is wide enough and large enough for your pet.  Place the ramp flat on the ground and allow your animal the time to smell it and eventually walk across it while it is on the floor to become comfortable with the presence of a new item (especially one you want THEM to use).  We learned the hard way that you can't get them to "walk" straight up into the car - as simple as this may seem, a 120 lb. dog will certainly tell you otherwise.

You may attempt adding "treats" as a way to coerce them to begin using it at a slight incline, and a lot of praise.  I do recommend allowing between 7 - 10 days of constant introduction to the ramp before you will see any results.  Once your pet is comfortable with the ramp, it may be easier to begin introduction by placing them "IN" the vehicle, putting the ramp up to the vehicle and allowing them to walk DOWN.

Pet Stairs can be a bit more challenging.  A dog can be tempted to use them at their own pace - leaving the stairs out in the area you want them to be used, and placing a few small treats on each step allows them to explore and be curious about the steps.  Once they attempt to use them and realize the ease of use, it will come naturally.

Not all animals have a hard time using the steps, if you have stairs inside or outside your home, then the use of pet stairs or ramps will come naturally, however, if you live in a single story and your animal is not subject to stairs or ramps, it is a training process (like everything else with animals).

Remember patience is important with anything you are trying to introduce to your pets - animals are unpredictable and we can't ever force them to do anything they aren't ready to do in there own time.