This activity can be used as part of a Science topic about selective breeding within ‘animals’ and ‘evolution’. It could also be linked to a PSHE/Citizenship activity exploring rights and responsibilities. It explores the differences between four dog breeds in the past and the same breeds as we know them today and encourages pupils to consider whether selective breeding is always a good thing. You will need: ‘How have dogs changed over time?’ worksheet for each pupil to record comparisons of dogs from the past and present. Optional PowerPoint slides and explanatory notes for whole class discussion.