Declension table of ?śaśvasāna

Neuter	Singular	Dual	Plural
Nominative	śaśvasānam	śaśvasāne	śaśvasānāni
Vocative	śaśvasāna	śaśvasāne	śaśvasānāni
Accusative	śaśvasānam	śaśvasāne	śaśvasānāni
Instrumental	śaśvasānena	śaśvasānābhyām	śaśvasānaiḥ
Dative	śaśvasānāya	śaśvasānābhyām	śaśvasānebhyaḥ
Ablative	śaśvasānāt	śaśvasānābhyām	śaśvasānebhyaḥ
Genitive	śaśvasānasya	śaśvasānayoḥ	śaśvasānānām
Locative	śaśvasāne	śaśvasānayoḥ	śaśvasāneṣu

Compound śaśvasāna -

Adverb -śaśvasānam -śaśvasānāt