Killingworth Animal Hospital Always Above and Beyond Come meet our 5 Doctors, and numerous staff...especially our resident cat Nick." Hey listen up... ONE shot every 12 months! Now we're talking. We have the only heartworm preventative that protects for 12 months with just 1 dose. It's nick approved Mention This Ad & Receive f #wheresnicknow O Your 1st Visit FREE! 208 Route 81 Killingworth I 860-663-3003 | Open Mon-Sat. Killingworth Animal Hospital Always Above and Beyond Come meet our 5 Doctors, and numerous staff...especially our resident cat Nick." Hey listen up... ONE shot every 12 months! Now we're talking. We have the only heartworm preventative that protects for 12 months with just 1 dose. It's nick approved Mention This Ad & Receive f #wheresnicknow O Your 1st Visit FREE! 208 Route 81 Killingworth I 860-663-3003 | Open Mon-Sat.