While committing to a long-term employment contract may not be required for employment, a potential employer still wants to know if you plan on staying and becoming established or if you may have potential plans for change later. It is important to be honest, even if you feel like you may not be able to commit to long-term employment.
"I have no plans of relocating and all of my family live close by. I have traveled before and have come to a place in my life where I want to find a stationary position and grow with a company. With those things in mind, I do not see a predictable circumstance that would cause me to be unable to continue employment."
"My goal is to find a position that will allow me to work long term. I do not anticipate any significant changes that would affect that. I have family that lives nearby and close ties to the community."
"I am seeking to find a place where I can work and can become established. I don't foresee any changes in my life that would be significant enough that I would not be able to continue employment. I am actually really looking forward to the possibility of becoming part of such an excellent group of veterinary care providers."