Injection-site sarcoma is a rare but aggressive cancer in cats linked to vaccination and other injections, with significant welfare implications requiring preventive strategies.
Injection-site sarcomas cause serious welfare impacts from tumour growth, metastasis and the invasive treatment required. Welfare priorities include using non-adjuvanted vaccines where possible, administering vaccines in recommended anatomic sites, monitoring injection sites for persistent swellings, and providing multimodal treatment combining surgery, radiation and chemotherapy.