Separating a puppy from its mother too early may have long-term consequences on physiological and behavioural development that risks behavioural problems later in life, a major reason why dogs are given up or left in shelters, warns the author of a linked comment.

 

In the UK many welfare and veterinary organisations, such as the Animal Welfare Foundation, Blue Cross, PDSA and the Dogs Trust, recommend that puppies shouldn't be separated from their mothers until they are at least 8 weeks (56 days) old. There are legal restrictions on selling a puppy under this age in the UK.