The strike follows a breakdown in negotiations for better pay and conditions earlier in the year.
Valley Vets, which is owned by VetPartners, offered a 7.27% increase to its lowest paid staff, with smaller increases for higher paid staff.
However, the BVU rejected the offer, describing it as a "derisory real terms pay cut".
A postal ballot was held and 94% of members voted for industrial action, with a 93% turnout.
The BVU says it is open to restarting negotiations in the hope that an improved offer will make the strike unnecessary.
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Aged 15 we studied a play by Sean o’casey. Juno and the paycock. An Irish play set in the 20’s. The memorable quote. “Management sacrifice one employee and the union ensure that another 100 lose their jobs.” Given recent decision of 2 other corporate practices to restructure (and yes I have seen the ruptured spleen post) I would urge all sides to moderate their language and rhetoric. Is it better to have more people employed at a lower rate than fewer employees at higher rate. What constitutes a victory for each side. Remember the art of compromise is to cut a cake in two and make each person feel they got a slightly bigger slice than the other person.