If there is one tick on the body it also indicates that there can be ticks or larval stages of eggs on the body of the pet and the ticks would have laid eggs on the bedding material of the pet or would have laid eggs in cracs and crevices of home
To control ticks there are many options like
Powder
Shampoos
Sprays
Spot on Tablets
When the tick infestation is more and pet is above 6-8 months then better to go with tablet or spot on
There are 3 brands of tablets are available by name simparica, nexguard, bravecto
U can choose any one based on cost effectively
But bravecto has 6 months protection better to go with that