Sparky needs to be solo dog

She is a 9 year old chihuahua/terrier mix. She is very loving and a great lap dog. She prefers to be the only dog in her home and will bark a lot if left outside alone for too long. She is potty trained as long as she is let out every few hours. She eats once a day, soft food mixed with high protein puppy kibble. We love her but can’t give her the attention she deserves in her older age.