Here's a cat and dog couple I drew back in 2013. Here's some details for 'em;

Nathan "Nero" Romanov

200cm | 110kg | black mane | blue eyes | 07/1989

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Nero is a student of eastern European descent. Friendly, cuddly and unaware of his own strength he tries his best to be social. He's strong with some muscle, and his sclera aren't visible.
He invited Duke to live with him in 2012 and hasn't looked back since, happily in a relationship with him. He worries that he's overly sexual for his partner.

Daniel "Duke" Johnson

172cm | 77kg | blonde hair | green eyes | 04/1992

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Duke is a student similar to Nero, but from the UK. A little thick-skinned and cold in disposition, he prefers to keep to his own company for the most part (with an obvious exception). Chubby, short and blonde haired, Duke has slit pupils.
He doesn't enjoy the constant affection and attention doted from and required for Nero, sexual or otherwise but does his best to make the relationship work.

For more info, you can see this pic on my Inkbunny.