Anonimais is an animal welfare association focused on improving the lives of domestic animals and addressing overpopulation, abandonment, and mistreatment. Its work combines public education about animal dignity and appropriate care with practical support for animals at risk. The association promotes responsible adoption of docile animals and access to veterinary care, particularly sterilisation for stray animals. It also accepts applications for individual animals and for colonies or packs, highlighting sterilisation as a way to help control population growth and prevent related harms.

Anonimais operates on a volunteer-led, network-based model and aims to equip volunteers with knowledge of good practices. It follows a no-kill policy and says it is committed to providing ongoing information about its activities and the use of collected funds. People can support its work by volunteering, becoming members, or donating money, pet supplies, and goods for its charitable shop. Proceeds from the shop support animal protection activities, including sterilisation, veterinary care, and adoptions. The association also seeks cooperation with public and private entities and other organisations.