Two people and a pet isn’t really a “collective”
From my vantage point their work fits the definition nicely.
"A collective body" [1] ... "Collectivized or characterized by collectivism" [1] ... "A political or economic theory advocating collective control especially over production and distribution" [2]
[1]: https://www.merriam-webster.com/dictionary/collective [2]: https://www.merriam-webster.com/dictionary/collectivism