Ask the Vet: Why is the Male Dog Refusing to Mount?

A male dog refusing to mount a female dog may be very upsetting for prospective breeders hoping for a litter of puppies. Can male dogs refuse to mount a female dog because he's stressed? Could the female not be in heat? These are many questions worthy of pondering. Veterinarian Dr. Ivana discusses some potential causes and what can be done to help.