Q: My one-year-old collie was recently mated by a mix shepherd dog and is possibly pregnant. I have heard that if I let her have these puppies, I will be unable to breed her to another purebred collie in the future and register the litter. Is this true?
Susan Martini, Costa Mesa
A: There is no rational reason why you cannot breed your collie in the future to another purebred collie and register the litter. Each breeding and each litter is a separate entity and has no residual effect on the following litter, unless an infection renders your female sterile. You should have your dog examined to determine if she is pregnant and make a decision on letting her have the pups or having her spayed if you do not want any future litters.
Q: I have recently read that parvo virus infections are still occurring with great frequency. We have two Pomeranians who were vaccinated with a '6-in-1' vaccine about five months ago. Does this vaccine have parvo vaccine within it? How often should my dogs be vaccinated? They are mostly indoor dogs with occasional trips to the park for exercise. Should I be concerned?
Daniel Savage, Newport Beach