Hi! We have a 1 year old chihuahua and he is allowed to go on every furniture in the house. Beds, sofa, chairs.. But in a few weeks we are getting German Shepherd! And I dont want him to jump up on any furniture he decides to like the chihuahua does. So my question is if it will be any problem to teach him that because he will see that its no problem with the chihuahua? Thank you for your help!