Most pups will have 42 permanent teeth in place by about seven months of age. When the deciduous teeth don't fall out on time, the puppy may appear to have a double set of teeth. Retained baby teeth should be extracted by your veterinarian so that permanent teeth will have room to grow. puppy's age can be estimated by which teeth have erupted. While it can vary somewhat between breeds, here is the progression you can expect as your puppy develops new teeth. 1  The incisors are the first to appear at about two to three weeks of age.
Understanding Animal Research > Animals used > Numbers of animals. There were less than four million scientific procedures using animals in 2014 in the UK. The figure was 3.87 million. The number of animals used is slightly less as some animals are used more than once. This does not happen often, and is strictly controlled.
Click to see the number of animals used per year The number of animals used in experiments dropped away steadily between the 1970s and 1990, but has more or less levelled off in the past 15 years. Since 2001 the number of procedures using animals has risen slightly every year. The latest figures available show 2.8 million procedures using animals were recorded in 2003 - about half the number carried out in the early 1970s. The vast majority - 85% - used in tests are specially bred rats, mice and other rodents.