The best time to acquire a puppy is at 8 to 12 weeks of age. At this age a puppy should be well socialized, will have received the first series of immunizations, and should be weaned and eating solid food. The breeder can usually make a good guess about whether a puppy is of show or breeding quality. But keep in mind that picking a future champion at 8 weeks of age is a problem, even for breeders with considerable experience.
Most puppies look healthy at first glance, but a closer inspection may make some puppies more desirable than others. Take your time and go over each puppy from head to tail before making the final decision.
Veterinarians use a stethoscope to listen to the heart. You can listen to your dog’s heart by placing your ear against his chest. The normal heartbeat is divided into two sounds. The first is a lub,followed by a slight pause and then a dub. Put together, the sound is lub-dub, lub-dub . . . in a steady, evenly spaced rhythm.
The heartbeat should be strong, steady, and regular. A slight alteration in rhythm as the dog breathes in and out is normal. An exceedingly fast pulse can indicate anxiety, fever,...
Begin by examining the head. The nose should be cool and moist. Nasal discharge or frequent sneezing is a sign of poor health. Brachycephalic breeds, such as Pugs and Pekingese, often have nostrils that collapse when the dog breathes in. This is undesirable.
Check the puppy for a correct bite. The correct bite for most breeds is a scissors bite, in which the upper incisors just slightly overlap the lower ones. An even bite, in which the incisors meet edge to edge, is equally acceptable in most breeds.
Feel for a soft spot on the dome of the skull. If present, the fontanel is open. This is not desirable. In toy breeds, an open fontanel can be associated with hydrocephalus.
The eyes should be clear and bright. If you see tear stains on the muzzle, look for eyelids that roll in or out, extra eyelashes, or conjunctivitis. The pupils should be dark and have no visible lines or white spots that may indicate congenital cataracts or retained fetal membranes. The haw (third eyelid) may be visible. This should not be taken as a sign of disease unless it is swollen and inflamed.
The ears should stand correctly for the breed, although in some breeds, such as German Shepherd Dogs, the ears may not stand up fully until 4 to 6 months of age. The tips should be healthy and well furred. Crusty tips with bare spots suggest a skin disease such as sarcoptic mange. The ear canals should be clean and sweet-smelling. A buildup of wax with a rancid odor may be caused by ear mites. Head shaking and tenderness about the ears indicate an ear canal infection.