Ba chóir mhadraí a ghráigh?

Daoine a gráigheann madraí amháin?

Ná cuirtar isteach gan grá do mhadraí?

[Just a guess - someone else will do better.]

Ní fiú cur isteach gan grá do mhadraí

Duine a thabharfadh grá do mhadraí is é amháin a loirgimíd.

Or maybe it should be continuous and as this is an advert you can leave some words out:

Duine a thabharfadh grá do madraí á lorg againn

Labhrás could make a better suggestion.

Must love dogs:

- Grá do mhadraí ag teastáil
- Caithfidh (tú) grá a bheith agat do mhadraí