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Histiocytic sarcoma (HS) is a common tumour in flat coat retrievers (FCRs) often affecting periarticular tissues and joints. Palliative‐intent radiotherapy, seeks to achieve local tumour control, pain relief and improve limb function. However, the effect of palliative‐intent radiotherapy on analgesic levels of dogs with localised HS has not been studied. We hypothesised that palliative‐intent radiotherapy could improve lameness in dogs affected by localised HS. This study aimed to assess the impact of palliative‐intent radiotherapy on lameness of FCRs with localised HS. A retrospective cohort single institution study was performed. Medical records of FCR dogs with HS that received external beam radiotherapy between 2003 and 2022 were reviewed and included demographic, staging, severity of baseline lameness, therapeutic management and outcome data. Descriptive statistics, McNemar's chi‐squared test, Fisher's exact test and Kaplan–Meier analysis were used for statistical analysis. Thirty‐nine dogs were included with a median age of 7.2 years, 25 were male and 14 were female. HS was most commonly located in the forelimb (29 dogs, 74.3%), affecting the shoulder joint (19 dogs, 48.7%). Staging was performed in all 39 dogs with 22 (56.4%) dogs having localised HS, six (15.3%) dogs had localised HS with node metastasis and 11 (28.2%) dogs had localised HS with systemic metastasis. All dogs received palliative‐intent hypo‐fractionated radiation therapy, 32 (82%) dogs showed improvement in lameness. In conclusion, palliative intent radiation treatment has an analgesic effect reducing lameness or clinical signs associated with affected tumour‐bearing joints. [ABSTRACT FROM AUTHOR]

Background: Lymphoma is a neoplasm of the lymphoid tissue, which may present with localised or systemic clinical signs. Unlike dogs that commonly present with multicentric disease, mostly involving the lymphoid organs (eg, lymph nodes), feline lymphoma can present as visceral (eg, spleen/liver/gut), extranodal (eg, CNS/skin) or nodal in origin, with clinical presentation dependant on the affected organ. This variation in clinical presentation is further complicated by further indolent forms of lymphoma that have been reported; a cat can either present as clinically unwell with intrathoracic or intra‐abdominal forms, or it can present with some subcutaneous or multicentric forms, which may be systemically asymptomatic. Aim of the article: This article discusses the diagnosis and staging of feline lymphoma, the different clinical presentations, and outlines the most commonly used treatment methods. [ABSTRACT FROM AUTHOR]