Each year, over 100,000 dogs are imported into Germany from other EU countries by animal welfare organisations, mainly from Romania. This study conducted a systematic content analysis of websites belonging to 241 animal welfare organisations that rehome dogs from southern and eastern Europe to Germany. Assessment included transparency, legal compliance, and availability of educational and medical information for adopters. The study shows that many organisations lacked information regarding dogs’ origins, transport methods, or health status which sometimes makes it difficult to distinguish between dog rescue and illegal dog trade. Photos were mainly used in adoption advertisements and behavioural descriptions were only included in two-thirds of the dog advertisements which poses a risk of increased dog relinquishment post-adoption due to behavioural unsuitability. Information on vector-borne diseases and typical behaviour of imported rescue dogs was not provided comprehensively. Few organisations violated legal standards, offering underage or banned breeds and failing to use the TRACES transport system. Most organisations relied upon private foster homes, while few had no temporary housing available in Germany. Although most claimed to conduct pre-adoption checks, comprehensive contract details were rarely published. The number of existing animal welfare organisations that rehome dogs from southern and eastern Europe to Germany is unable to be determined due to high fluctuation and the lack of central registry. Inadequate health disclosures and behavioural descriptions risk poor adoption matches and increased returns. Lack of legal compliance may endanger both animal and public welfare and opens the door to illegal dog trade. Sustainable animal protection requires better adopter education, reliable medical testing, and local engagement in source countries to reduce reliance upon transnational rehoming.