Rotties are nice. We have a Beagle who sleeps 22 out of 24 hours per day in his petbed. Rising only to take a walk, eat a meal or beg for treats. Our Chihuahua is a love sponge and also easy to deal with.
My chihuahua is a mix of long/short hair and requires a brushing once or twice a week. Other than that, loves to warm my lap at all times.
Does your chihuahua get very excited and bounce around a lot?