the presently detected behavior for example a previously detected leg injury may affect the present movement speed of the pet such indirect influence may also have to be in some embodiments the analysis system 200 also includes a history variation module 250 which is configured and operable to determine variation of long term behavior of the dog as compared to previous behavior such long time variation data may provide indication of health related issues aging obesity etc for example if a dog is identified as shaking his head a significant number of time in a day higher than what he is used to e g 20 30 as compared to normal level of 3 4 the system may suspect ear infection and provide appropriate alert to the owner reduced level of energy along a few days may indicate other illnesses which may require treatment etc more specifically reference is made to fig3 6 illustrating dog 39 s behavioral states with respect to determined attributes fig3 illustrates determination of the orientation of the dog 39 s head based on low frequency varying acceleration data this figure shows acceleration data in x y and z axes and the head direction attribute as determined based on this data as can be seen the dog starts while accelerating to different direction and thus may be excited additionally the z component shows low frequency bias to negative acceleration which results from the gravity after a few seconds the dog looks up to his food and the head direction changes as a result of higher gravity component in the x data component the dog than relaxes and waits for his food and when the dog starts eating all acceleration along y direction vanishes.