Hyperthyroidism is rare in dogs but when it occurs, radioiodine therapy (I-131) offers a curative option with welfare implications related to isolation, stress, and post-treatment monitoring.
The isolation requirement of radioiodine therapy presents a real welfare challenge for dogs, who are highly social animals. Extended separation from owners causes anxiety, sleep disruption, and sometimes refusal to eat. Facilities that provide enrichment, regular low-contact interaction, and calm environments reduce stress during this period. The treatment itself is painless and effective — the welfare cost is primarily social and environmental rather than procedural. Post-treatment monitoring for hypothyroidism is essential, as undetected hormonal imbalance causes fatigue, weight gain, and reduced quality of life.