Premier Veterinary Group increased the number of pets that are signed up to its Premier Pet Care Plan (PPCP) by 31% to 201,000 in 2017.
In the US, the number of pets on plan increased to 5,000 from 1,000.
Premier said the US remains a significant growth opportunity and the business continues to invest heavily in the market.
In the UK, the number of pets on PPCP has grown by 24% to 164,000.
In Europe, the number rose by 52% to 32,000. The group's most significant territory in Europe is the Netherlands, which remains on course to become profitable in the financial year ending 30 September 2018.
At 8:52am: (LON:PVG) Premier Veterinary Group PLC share price was +1p at 38.5p