Mil has a 10 year old dog and she's took her for a senior health check! I thought I'd do the same with my 9 year old medium to large dog. The vet phoned me today to say some liver enzymes are raised. He said either take her bloods again in 4 to 6 weeks or do a test whereby she has bloods, eats something then has more bloods. I opted for bloods in 4 to 6 weeks but I'm worried now.