The average age of pet dogs and cats continues to increase such that between one third
and one half of pet dogs and cats are 7 years of age or older [
[1]
]. In the United States, there has been a nearly twofold increase in the percentage
of pet cats older than 6 years of age (from 24% to 47%) over the past 10 years [
[2]
]. Likewise, in Europe the number of dogs considered to be “senior” (>7 years of age)
increased by approximately 50%, whereas the number of cats older than 7 years of age
increased by over 100% between 1983 and 1995 [
[3]
].To read this article in full you will need to make a payment
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