Difficult! Search For Yaoi!

Hey guys i would like to find a yaoi manga which i read a long time ago. It's about the seme and the uke who are impersonating a dog and a cat. They are owned by a vet/doctor and i remember in one chapter the uke got sick and the seme stole some butt pills for the uke and tried to make him take the pill but instead penetrate him. In another chapter the seme cuts his hair and the uke doesn't recognize him. That would mean a lot if u know it.