Fluvoxamine and the SSRIs in general are actually used as antidepressants and behaviour modulators in dogs and cats among other mammals, with similar effect to

Fluvoxamine and the SSRIs in general are actually used as antidepressants and behaviour modulators in dogs and cats among other mammals, with similar effect to humans; improving sociability, increasing healthy reward-seeking behaviours, and reducing irritability. So your can probably get it from your local vet. (Don't get ideas.)